I am thinking about:
- specialisation of these mgastructures. For example, if a ringhabitats you just finished building happen to be close to your planet and it is in good defence position. Why not further specialise into military use?
- specialisations I can now think of in my little brain:

* Millitary (with offence/defence ability, maybe link to or not link to events?),
* Economic (Trading ports - boost minerals and maybe influence),
* Diplomatic (this can link to series of designed events to gradually make it accumalate influence),
* Science/ Research facility (like those installation in Halo, not purely used for habitatm but also research facilities. This can be typically generate one of three kinds of science for player. Or make you have alien pets?)
* Species preservation (get you alien pets?)
* Black market (next tier of specialisation from trading post, has penalty to sector income but grants extra strategic resources?)

- these specialisations should all be once and only chance, if you choose a specialisation, it cannot be reverted back. maybe also limited to one copy of a type per empire?
- these specialisations all come with relatively high cost for dire need, added a variant of less building time but far less profitable?

and many many other little things in my mind ~ depends on how Nutsoman sama would like to develop this mod further.

oops, some of them are already been covered? looks like I have been away for too long! Thank you!

http://prntscr.com/czl04z
is the Habitat supposed to look like this on the inside? i thought it used to have the earthly? segments before

Huh... yeah, that's a bug.

What about something like the Star Forge from KOTOR? You have a massive device capable of producing a huge amount of energy already with the Singularity Generator, so what about something equivalent for Minerals? The way the Star Forge worked was by drawing matter/energy from a star and converting that into raw materials.

http://starwars.wikia.com/wiki/Star_Forge

I'm not saying just add the Star Forge, but perhaps something equivalent to that mechanic. It's certainly a Megastructure.

Actually that does give me an idea, but the resultant building won't give minerals. Ideas ideas :)

how feasible are permanent wormholes?

what I'm thinking about is creating a stargate-like structure that, once activated, creates a permanent link to it's counterpart (maybe by naming it and the other one the same). if you move a ship in orbit, it gets instantly transported to the other end.

I'd say only one is possible at a give time, otherwise your ship take damage in the transfer.

I'd actually toyed with the idea of linking Black Holes in that manner. Doing so would be tricky, but I'm ruminating on how it could be achieved.

Maybe sometime like the supergate from Stargate? http://stargate.wikia.com/wiki/Supergate

Pros: Instant-travel to any linked station in the galaxy
cons: Can only be built next to a black hole, enemies can hack it and use it and it's costly to repair

Then there is another idea that is a way to turn a habitat into a shipbuilding yard to make building fleets go by faster

Cons : Is horrendously hard to script. However, progress has been made.

Also, dynamically linking stations in networks is impossible.

Quantum AI Prison:
You would need All AI Research completed, then you have to build 4 QAI buildings in a square with one tile space inbetween. These QUI builldings give 2 adjancency bonus on research. The tiles inbetween have to be 2 Physics and 2 Engeneering Research buildings, the last building would be in the center which then generates +10 Research of each type.

Backgroundstory:
You have managed to build and imprison succesfully an AI which was already sprialling towards Transcendence.

Negativ Effec:
-10% Happiness on all your robot pops in your empire

a few days ago i complained about not being able to build Space Elevators where i wanted. While i am still of the opinion that randomly generated ressources on planets defining where and where not i could build them sucks, some restriction should surly be there.

Therefor i would suggest the following.

Have Space Elevators only on biospheres with water.
When you look at how here on earth such Elevators would be used, there is one schematic poping up again and again, that they would be installed on water due to the flexibility included.

Now that would have 3 biomes Ocean, Continental and Tropical which could use Space Elevators, which kind of would then be unfair to the remaining biomes which could not use them.
Therefor i would suggest to have another 2 Megastructures especially then for the otehr 2 by 3 biomes.

Dry Biomes Desert/Arid/Savana get Solar Mirrows, which send Solar Energy bundled to a recieving station on ground, creating massive ammounts of nergy.

For Alpine/Artik/Tundra a special type of research station, which decreases in research output, the more people are on such planet, which would then lean towards small worlds with lots of tileblockers still intact and just such a research station and only few otehr installations.

It is difficult to see the upgrade arrow of buildings on Urban worlds. Could you make the background colors of the tiles a shade darker or perhaps going more into smokey red of an evening sun,

If i may suggest, i was thinking Planetary rings. Forms an orbiting ring around the equator. The ring itself would not be habitable like a ringworld but instead would function as a powerful planetary defense structure. Would prob require a form of elevator tile improvement on the planet (possibly two). Make them expensive with regards to cost and upkeep, but would provide an effective defense vs small to medium fleets (excluding battleships with spinal mounts). Maybe have the ring be designable in the ship design menu before constructing, so you can put the weapons and defenses you'd want on them.