The journey began with designing a custom remote.  It needed proportional steering, proportional throttle, 2 momentary buttons for trimming speed, a power button, speaker, LED indicators, inductive charging, & to be ambidextrous.  It was a nosedive into designing lion machine interfaces.  It was achieved with just ordinary PLA.

Inventing a hall effect joystick using just ball point pen springs & temporary screws for assembly was key.  It was not possible to make it waterproof.  An entirely new remote with binary controls would have to be built for waterproofing.