Dust Catch design for a Porter/Cable 680 and a standard 2.25"(5.715cm) Shop-Vac attachment

This is a dust catch I designed for my home CNC router. I use a Porter/Cable 680 router with a Rigid 5HP shop-vac. This is version 1 and I hope someone can find a use for it. I've added holes for set-screws to mount it to the router. I think it might be good to cut a length of rubber to go around the inner circumference of the router attachment as it will add better adhesion and act as a grommet. I've also added a hole on the shop vac attachment to put a set screw. My thoughts on that are that i