How about a pepakura/foam section? Nothing that says Iron Man, just everything related to it.
When it comes down to it, well over half of the threads in the costuming section and a ton in the props section are all foam and pep builds of Iron Men, it's clogging up the site's arteries and making it very difficult to find anything worth reading. I'm all for cool new projects on the boards, if somebody came in here and did an all metal IM from pep files (seen it, it was awesome) then I'd be happy to sit and read it. But foam is foam, it's done to death, and there's never anything new or interesting. I'm right with MB, the number of IM threads makes me visit the site less, and it decreases my overall enjoyment. With so many people moving over to facebook, etc. to post their builds, I think it would be a good idea to to do something to keep people here. Information sharing and community has already gone right out the window, but the forum isn't dead yet.
And let's be realistic here, the real value of a sub-forum isn't to give people a more specific place to follow their interests, it's a way to clear up all the stuff only some people want to look at to let everybody else go about their business without suffocating.