Fantastic Plastic made a 1/72 resin one which I believe still may be available. You can see mine here.
http://www.studiostarforge.com/products_gallery.htm
Another 1/72 version which looks a lot better is also about to be released as a garage kit, don't have the details to hand.
Anyway, I'm in on this one! I will probably go with either a FineMolds Millenium Falcon, or ARC-170 which I have in the stash.
Great idea for a group build!
www.studiostarforge.com