Not just any box. It's a cast aluminum box with gasket seals for my outdoor robot. I want to mount my circuit boards in the box, but I don't want to penetrate the box for circuit board standoff screws. I want to keep the outside of the box clean and free of any holes to keep it watertight as intended. I have considered something like bonding screws to the inside of the box with epoxy, but I haven't had much luck with epoxy reliably holding things together.