I suggested the removable tray/holder idea about 3 or 4 years ago when Seymour onion was trying to have cases made. I agree it would be perfect, as you only need 1 mould for the case, and any trays can be optional. They could even be made from card, like an original snes tray. And an empty case, without any innards can be used to store all sorts of things, from cables, handhelds and controllers to promo materials.