Sweet! You have a lot of faith in me if you think I even have a chance at turning a bolt action into a semi though. Some great men have tried, and the closest anyone has ever come was the Pedersen device. And all it could shoot was pistol ammo. If you replace the receiver, then it shouldn't be a problem, but then it wouldn't really be a mosin anymore.
I'll think of something, I may have to change my preferences though. As long as it is a semi auto x54R, I'll be happy. I would like to build something that has not really ever been built before (or at least mass produced). I'd like it to look like the rifle the Russians would have made if they had stuck with the 7.62x54R instead of going to 7.62x39.