Or you could hide an Arduino Due and a couple of batteries between two of the system boards and say you restored it, would save a lot of work... :) More seriou

Or you could hide an Arduino Due and a couple of batteries between two of the system boards and say you restored it, would save a lot of work... :) More seriously, how about using wood for the enclosure top (if RFI is a problem, a layer of tinfoil on the inner side may be enough)? It'd be a lot cheaper: I build most of the cases I make for Spectrum's Hands On projects using basswood because it's cheap, strong, and usually a faster process than e.g. 3D printing an enclosure.