This would be a Mutants & Masterminds 2nd Edition game set in an alternate DC Universe -- one where the major characters are introduced in the years they debuted in our world, and then age normally from there, interacting, marrying, having families and legacies.
It would steal heavily from "Elseworlds", especially Generations, The Golden Age, and The New Frontier.
I've put together tentative timelines for the Superman and Batman legacies, and I have ideas for the Marvel Family that I haven't typed up yet, but after that, I just... petered out. There are major legacies I need to timeline, and hten I need to go back, figure out how they intertwine, and revise accordingly.
So, I need a GEEKTANK! A thinktank of geeks to brainstorm ideas based on this premise -- largely just for the fun of it.
I may set up an LJ community for it -- if I could find some kind of Q&D Wiki, that would be ideal, since we could all brainstorm on timelines.
I know I've got fanfic writers and comics fans in my flist who could come up with good stuff here. Who wants in?