I'll start looking.

I think from prohibition to 1941. We can have Hyman Roth and Vito running molases from Canada, someone to play Genco the consigliere and develop that character....Luca Brasi killing Capones people, and of course SOnny getting into fights with his brothers. I'd like to see a scene where he tries to fight Michael and Michael wins, after which SOnny always beats the crap out of Fredo.