What Tony is talking about is the hardware to attach the holster to the belt. He would like it if he could use the same belt for both Stunt and HWT so he is making the holster remove able.
There is no requirement for the kind of attachment hardware you should use to attach the holster to the belt. As I see it, you have two options; either use chicago screws, or since every snap has a hole in the center, you could rivet the snap to the belt. If you do that, don't squeeze the rivet too hard. Depending on what brand of snap you use, popping the rivet all the way down might warp the snap. Just pull hard enough to set it. Whatever method you choose, just make sure you paint the outside white so it blends in against the belt better.
As for the backpack. Make sure you have all the proper components just don't make it dirty. A little scuffing and weathering is fine.