I used the ‘Rugged Box’ by Whity (which is a remix of ‘Tool box parametric’ by Yanev) and the ‘8BitDo SN30 Pro Case’ by Jallark as the inside to hold the gamepads, as well as the ‘8Bitdo SF30/SN30 Pro Contoller Stand’ by Mark579 on Thingyverse for the SNES logo.
I beefed up the joints as much as I could because the leverage when putting the screws in makes it very easy to rip the tops off the joints.
I went for a flat design so it can easily slide into my bag without feeling too bulky.