This is just my opinion.
I would not do it.
IMO, the real appeal of the M1C derives from it's originality, uniqueness and rarity as examples of the military attempting to adapt their rifle to a new role. This is the basis for its collect-ability, its scarcity and associated price.
There's nothing wrong with making your own but you will end up with a scoped, semiautomatic rifle that is rather lack-luster in its accuracy.
It will not be an original M1C. Someone down the road (after it leaves your hands) might be concerned it was an attempted fraud, so be sure have it marked in a way that is somewhat obvious that it is a reproduction.
It would be, could be, fun to have. Still, I would not do it.
If you do it, ENJOY!
P.S. - I have an original M1D, with its full kit, purchased via the DCM lottery back in the 1990's. It has never been fired by me.