Need some advice

Hi there. recently i started a custom arcade stick project that i plan on selling when I’m finished. I’ve ran into a couple problems so far though. It is wireless for ps3 (sixaxis +axisadapter.) But when I Lined up the sixaxis with the back of the stick in order to be charged I couldn’t figure out a good way to place the sixaxis without having to jab at the usb input constantly. How do you guys get the 30mm holes for sanwa/seimitsu buttons? I looked at a bunch of different stores and couldn’t find the forstner bit hole saw bit or drill bit. Also: I was trying to center my happ competition in a 18mm hole but found it near impossible, Should i just sand out the hole or what? Sorry for vagueness and lack of pictures, I will provide further detail on request. Thanks for any help!