Having carried a couple of different shoulder rigs in my 31 years in Law Enforcement, I can say my personnal choice would be for a little thinner leather on the straps and most definately a retention strap on the holster. I have personnaly witnessed a detective from my agency wearing the oldstyle verticle holster ( Dirty Harry style) approach the witness stand to be sworn in and while taking the seat to testify, bent over to adjust his pants and a cocked and locked Colt .45 hit the floor. Got real quite in the courtroom suddenly. Without some positive way of securing the weapon your inviting disaster. For a law enforcement type it is difficult to reholster a weapon in a shoulder rig, snap the holster and control a suspect at the same time. An old firearms instructor once told me that one thing a cop always brings to a domestic, barfight or any confrontation is a means to cause harm, his sidearm and it is in his best interest to maintain security of that weapon at all times. Same goes for the mag pouches, some type of restraining device to keep them in place would be helpful. Does you no good to grab for reload and find that you've lost them.
Nice workmanship on the rig!!