I designed some 3D printable part for my Amiga and ZX Spectrum. A smaller GoTek case and a Gamepad. The GoTek case is designed to fit the design of the Amiga better than the stock ABS casing they come with. I find the gamepad much easier to use than digital joysticks, and the second button can be wired to function as "up" either directly or via a switch to turn it on or off.

Free downloads:
https://cults3d.com/en/3d-model/vari...or-mini-casing
https://cults3d.com/en/3d-model/vari...-amiga-gamepad
https://cults3d.com/en/3d-model/vari...ectrum-gamepad