Atomic Robo, Hellboy, and Weird War Two...
Sounds like it could be interesting. I'm always a little wary of set-ups that let the characters all come to the table with entirely different intentions and moving in entirely different directions. Not to say that's what you have here necessarily, but if you do take it to a game I'd love to see some seed to give cohesion to the group, whether it's a premise or a mission or a common background or... etc. That might even be based on player input, but just a way to make sure players create a group rather than a bunch of unrelated individuals, since those individuals could be REALLY different with a big, wild setting like this.
A question, just for curiosity and clarity: When you say magic will be very limited, do you mean spell-casting PCs, or do you want to limit magical background elements? To use the obvious reference, would a demon-origin background (in whole or in part) be on-point for PCs, or does that fall under "limited magic"? Would a magic sword be the kind of thing you want to limit, or are you thinking more like active casting of magic?
For those without the book, there is a very good SRD for Fate Core that includes Atomic Robo mechanics. It's not as good as the book (less examples, etc.) but it lets you access all the mechanical bits you'd need. Of course, it's entirely up to liblarva to choose a preferred level of familiarity with the rules and book itself.
EDIT: ahh, yeah that SRD mentioned above... That's what happens when you stop for tea half way through a post.
This message was last edited by the user at 15:46, Fri 12 Apr 2019.