Thanks a lot. Well, most parts are self constructed and printed, the main body is... a painted drainpipe part 😉
The wheel is a rotary encoder, which takes control of the P1 mouse when spinning and performs a circular motion of the mouse, which causes the game's pirate wheel (e.g. in the beginning of the first level) to work correctly. Works like a charm with the RPCS3 version, but as mentioned before only for P1 ATM.
When Windows raw input support would be implemented in the emu, everything would be easier...