I'm cutting mine with a milling machine. THe window will be 1/4-3/8 larger than the opening and milled down the thickness of the case so it will be flush. I then plan on gluing it with either silicone caulk or shoe goo. Maybe JB weld will be stronger? I sometimes put my other quasar pro charger on top of the gfx on my pit tabel, it needs to take some abuse.