The official Fallout 4 mod tools aren't even out yet, and people are already making incredible creations like this. GirlPlaysGame doesn't have time for your fancy G.E.C.K. Creation Kit, and has gone ahead and imported BioShock Infinite's Columbia right into the Wasteland. According to the blog post, about 99% of the stuff in the beautiful/mega-racist paradise is from Fallout 4 itself, with the last 1% presumably made up of the darkest blood magic.
You can check out the video above for a nice tour, but GPG has also supplied some really neat screencaps to give you a better perspective on this impressive creation.