If there is a need to drill two big holes close to each other, sometimes helps drilling first with a 2-3 times thinner bit and then with thicker one.
that shouldn't be an issue for me. At the most I"ll have 4 "holes" besides the void space I'm milling out of the middle for
batteries/components, the holes will be for the bolts that will hold the body and faceplate together and they will be going straight
through both parts so nut and bolt style instead of threaded hole. I'll be leaving 45degree corners inside the void space to increase strength in the corners and to give me room for the bolt holes and the bolts themselves are going to be tap fit so it should completely fill the void space I create by making the bolt holes. I decided to go bolts instead of a slot or magnet because I want to use the nut and bolt heads as a 'rest' sorta like little feet for the
mod to keep it up off the table incase some one spills water or something or you set it down on a damp or wet surface.