Basic premise:
What happens when you combine MvM's upgrade stations with one of the longest-lasting gamemodes there is in TF2? You get absolute chaos, as well as absolute fun! The basics are that this is just ctf but everyone has access to the MvM upgrade stations inside their spawns, allowing them to upgrade their gear to make them even more dangerous. Certain buffs will be removed for being useless or overpowered (like spy's armor piercing or the medic's shield) so that it's a bit more fun overall, though most buffs will remain. What this would lead to is a simple ctf map at the start but absolute mayhem at the later stages if the game lasts long enough.

Money will be provided to people in two main ways: random piles and point-scoring. There will be stacks of $25 on the ground in certain places so that people on defence don't need to try to run out and get kills to not be left too far behind (like engineers, medics or spies). Kills will provide $150 for most kills except for 2 places on the enemy team: 2nd place will give $175 while the other team's MVP will give $200. Any kills you get will also provide your whole team with $10 each ($15 for 2nd and $20 for enemy's MVP). Objective capturing provides $250 to your whole team and $400 to the capper. Any other points you get will provide you with $100, like giving teammates sandviches or extinguishing them. Finally, any kill assists will provide either $50, $75 or $100 depending on who the assist was for.

Maps:
ctfs_2fort (Just 2fort)
ctfs_turbine (Just turbine)
ctfs_doublecross (Just doublecross)
ctfs_well (the old ctf_well, but now with supercharge stuff!)
ctfs_scrapyard New! (A new map with the majority of the map as a scrapyard, complete with insta-kill pits of molten metal and a large, open area for the middle with a few hiding spot and tunnels)

Super-charger!
Complete a ctfs map in under 5 minutes

I don't need upgrades
Kill a total of 100 upgraded players who have spent >$1000 on themselves without upgrading yourself in any way

Supercharged offense!
Win a game of ctfs without the enemy team picking up your intelegence once

Supercharged defence!
Win a game of ctfs that has lasted over 20 minutes without giving up a capture

Fully optimised!
Fully upgrade your player upgrade tab

Top-tier weaponry
Fully upgrade your primary weapon

Super spender
Spend a total of $1,000,000 on upgrades

The immortal mann
Kill 10 upgraded enemy players in a single life

Hard to kill
Survive over 250,000 damage in your ctfs career

Not-so-critical damage
Survive 500 damage from critical hits in a single life

World tour
Play and win games on all 5 ctfs maps

Critical canteens
Use a single canteen with crit boost to kill 5 players

Uber-charger
Use a single ubercharge canteen to survive over 500 damage without dying

Maximum power!
Fully upgrade a class with all of their upgrades

Small but mighty
Use canteens to help you get a total of 1000 kills in your career

Damage-dealer
Deal over 2,500,000 damage in your ctfs career

To the victor...
Kill the other team's MVP 3 times in 1 game

...Go the spoils
Collect a total of $250,000 over your ctfs career

Revengineering
As an engineer, kill an enemy who has just destroyed your sentry gun with a crit boost canteen within 5 seconds

Uberpowered
As a medic, use a single Ubercharge on a teammate and help them gain 5 kills before the Uber runs out

Staying a-head
As a sniper, headshot and kill an enemy player who has at least level 2 bullet resistance

High-value target
As a spy, backstab the enemy team's MVP

Supercharged milestone 1:
Complete 10 of the supercharged achievements
-Completion reward: "Static-Charged Scraphead" (Cosmetic)

Supercharged milestone 2:
Complete 20 of the supercharged achievements
-Completion reward: "Hearty Hat Generator" (Cosmetic)
-Completion reward: "Supercharged Mann" (Cosmetic)

Basically just MvM but with a single, neverending wave. The old MvM maps could be used, but with more difficult or complex waves appearing. If the whole wave is beaten it will loop with stronger robots each time, until it gets to the point where it becomes basically impossible to win.

Per loop robots will recieve different buffs:
Normal robots: +50 health, +10% movement speed, +5% knockback/airblast resistance
Giant Robots: +500 health, +8.5% movement speed, +7.5% knockback/airblast resistance
Tanks: +10% of their max health, +2.5% movement speed

In perspecive this is what it would look like on some robots:
-Class ll First loop l Second loop l Third loop l Fourth loop l Fifth loop
-Scout ll 125 HP, 133% speed, 0% kb res l 175 HP, 146% speed, 5% kb l 225 HP, 159% speed, 10% kb l 275 HP, 172% speed, 15% kb l 325 HP, 185% speed, 20% kb
-Giant Charged Soldier ll 4000 HP, 40% speed, 70% kb l 4500 HP, 48.5% speed, 77.5% kb l 5000 HP, 57% speed, 85% kb l 5500 HP, 65.5% speed, 92.5% kb l 6000 HP, 74% speed, 100% kb
-Tank ll 40000 HP, 25% speed l 44000 HP, 27.5% speed l 48400 HP, 30% speed l 53240 HP, 32.5% speed l 58564 HP, 35% speed

The buffs, though small, will stack up considering how many robots will be present with each loop (usually around 200-500) so the loops and the sub-waves within them will get harder to stop

Overloaded:
Fully max out all of your stats in a single game

Second Rounds:
Complete the first loop of any mission

Third Time Lucky:
Complete the third round of any mission

Four Glory:
Complete the fourth round of any mission

Loopy:
Complete the fifth round of any mission

Unstoppable:
Beat 10 whole loops of any mission

Hard-Wear:
Deal a total of 25,000,000 damage across your career in survival mode

Laboratory: (koth_laboratory)
A KoTH map made to look like a large, stereotypical laboratory. During halloween the 'spider boss' spawns in, though it can still be played without the boss outside of halloween as it won't just be a reskinned map.

Scrapyard: (arena_scrapyard)
An arena version of ctfs_scrapyard. It has a point in the middle surrounded by molten metal with 2 bridges leading to it in the middle. The large areas in the bases have been removed since those were mainly for the intel. The spawn rooms have also been moved forwards to allow you to quickly leave your base.

Showdown: (mvm_showdown)
A map mainly made of a single, large bridge seperating a massive robot carrier and one of the mann co. branches. There are few hiding spots outside of the battlements above the mann co. building and two small rooms halfway across the bridge. The robots travel forwards straight from the carrier to the bomb depot with no twists or turns for them to be caught out on.

Seashore: (mvm_seashore)
A small seaside town with 3 caves coming from the sea, with robots and tanks coming from said caves. They go across a small part of the beach and up some stairs to a small village. There are a few twists and turns but most of the map is fairly small and hard to get lost on.

Deforestation: (mvm_deforestation)
A mvm level in the woods. The robots come from a dark, dense part of the forest while the tank comes from a massive clearing covered in tank tread marks. There are few places to hide outside of a few fences, some trees and a building in the middle of the area. The mann co. base here is also made out of logs, which is a nice touch. The map itself is small with a couple of places where the robots can change paths, but they all end up at the base. To find the path tanks go just look for the tank tread marks that go from the carrier's clearing to the base.

Steelworks: (mvm_steelworks)
A large map featuring gates a lot like mannhatten but also being able to have tanks as well. The start has two paths, a smaller, metal, suspended that goes down stairs to a large concrete level with the first gate with the other path starting underneath it and going around to the other side of the nest level. The path then goes over the top of the first again on some more metal suspended paths and then around two corners to the 2nd gate. Then it just goes down a ramp to your base.

Scrapyard: (mvm_scrapyard)
A large, mostly open map with 4 entrances for the bots at one end of the map and the other end the bomb drop and player spawn. The floor is mostly made up of scrap metal with the occaional pieces of robot and tank visible. It has some small molten metal pits here-and-there and some piles of scrap but it is mostly just flat ground, leaving few hiding spots.

Stronghold: (mvm_stronghold)
Another very open MvM map. This time the robots spawn from 5 different gates at 1 side and your side has a bomb drop, a spawn and a gate (since you spawn inside of said stronghold). The gate itself can take up to 5000 damage without being destroyed, though tanks and a couple of giants can take it down instantly. The field itself has many hills and battering rams along it for cover.

Scrapyard: (ctfs_scrapyard)
A scrapyard-based area exclusive to a new gamemode idea. Most of the space between the two bases is a large scrap heap, complete with things like large metal plates and cars to navigate past. The map also has occasional pits of molten metal that will kill you if you fall in them, but their bright orange appearence gives them away amongst the greys of the scrap.