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Regarding the third installment, as far as I know, it all started as a thesis project, has been ongoing for over a year, and is not quite finished yet. But the third game, in this sense, is still simpler.
I think that the endless and painstaking work with a disassembler and ArtMoney has more potential than trying to recreate the .exe file. And AI is not the main problem here.
Of course, Nival's work is not a sandbox for creative fans, but it is still a pity that the source code is closed.
As for the mentioned mod, I think I saw it on VK /photo-10814503_292876389.