BM1,
Except for the cartridge you have recreated the 4596s sold through Lew Horton, 4516 slides on 4506 frames. I always assumed S&W never sold a model 1016 because the allowable recoil spring length combined with lower slide mass increased slide velosity too much but it may have been only due to marketing considerations. So far as I know Glock is the only compay that has mass produced 10 MM autos with barrels under 4".