Is the belt dedicated to the holster yes does he draw right handed or left right is that a snap buckle at the top of the holster no it's a quick disconnect and screws I think you can do this for 10.5 " with no problem it might even be better set the lower loop a bit more to the middle of the holster that would work even better you can adjust this holster more to the center of your chest he has it were he likes it but not how i would were it that's for sure it's a simple build make one and have fun with it if I can help let me know . Good luck