I have unmodded game, latest ver. 1.82
Have DLCs:
Mega Events, Revenge of the Snathi, Ship Designer's Toolbox, Mercenaries Expansion Pack
Tested on my main machine and on laptop.
Faction available, no errors.
I know I may be called noob, but I stick to "vanilla experience" after some bad experience with GRM ("who is not using GRM these days anyway???", well, here am I... at least me from which I know). Please do not mess with the shipsets, or it will stop validating this faction on game startup.

http://psteamcommunity.yuanyoumao.com/workshop/filedetails/?id=633138322
Necron ships : Volundz

Volundz has necron and tyranid ships in his list if you want to use necron ships, tau and imperium and chaos etc as well

Am playing through with this race now and they're wrecking everything! Once Production is high enough you can fill a planet with population in just a few turns!

The traits: Well, i usually like races that are really specialized. These traits however are really strong, you can boost Production so hard. The low agility and (especially) low accuracy seems to make their ships only suitable for beam weapons though and balances that a bit.

Farming points from negative food and growth attributes for a synthetic species gives these guys a real edge. Use with caution ... these guys are seriously uber.

not realt accurate just that if they hit you your dead they only need one hit

But i thougth necrons where accurate.

Nice work. I need to figure out how to post my custom race.. I made a nice imperium

Would love some Necron ships in game!

These guys make anybody look like kittens ;)

Flay-Spam! :D

These guys make the Korath look like kittens...