I started with the trade center because I thought it would be easy.
I was wrong.
As for weapons, it has a pulse rifle and 'rail gun'. I think both of these fit.
As for other weapons, I was thinking either standard fair (hand gun, automatic minigun, rocket launcher, grenade launcher) or more OP2 style weapons (laser/microwave rifle, stickyfoam launcher, acid cloud launcher, lightning gun (thor's)).
Maps... well, that's why I was asking about internal architecture. I'm not very good at that sort of thing -- I get easily lost and the current state of the Trade Center is a good example -- it's a big, cavernous thing and I really have no idea what belongs in a trade center.
The good thing is Tesseract comes with a lot of decent free/public domain assets (like desks, computers and the like) which ought to fit well with the OP2 theme. Despite being on a different planet their tech isn't a whole lot more advanced than what we currently have.