The most immediate challenge is in the bolt retention. I have looked at designing something like a snatch grip with a quick release, but it just scares me a little.
I also though something like this may work too: http://www.mcmaster.com/#standard-sp...ungers/=sxm9fj
McMaster P/N: 7805A11 or 8692A11
edit2: After looking at it some more, those styles wouldn't have a flat surface to retain the frame itself. I think P/N 8691A31 would work the best and could be used with a washer to get a better holding surface.