I ran out of bits and patience one night recently and thought I'd try the factory method.... self tapping sheet metal screws. We get our kits with some aluminum panels already in place for shipping. We then unscrew them and then rivet them back on. One advantage we Canadians have is Robertson (square socket head) screws. I bought a few hundred #6 and tried it. These nuts don't slip off your bit and even sometimes don't come off unless you force them. Any Canadian will tell you they prefer them over any other fastener. Used a spring loaded center punch to put a tiny dimple where I wanted to put one. Wow! it takes 2 seconds to drill and fasten per screw. I'll do a video to demonstrate later. It takes an impact drill to do it. Advantages are really fast holes drilled and threaded. Removable screws allow clean non-destructive and quick disassembly and reassembly. You can use them as pilot holes for larger rivets or nut-rivets. If you strip them you can go to the #8 size. I don't see a down side.