That would take a lot of work to make it even remotely similar to the Sherman. The hull shape, the turret shape and the running gear is totally different and you'd be better off converting it to an M-46, M-47, M-48 or M-60 Patton variant than the Sherman.

After all, you'd want it to look good, right?

-Harq

Anyway, I imagine before too long there will be a Heng Long 1/16 Sherman and if I were them and just to make it slightly different (so it won't appear as a direct copy), I'd make it with the standard 75mm instead of the 105mm howitzer version [:'(] which isn't really a tank but mobile artillery.