Sure 
But my goal was to control a toy tower crane with the space mouse.
It was at the beginning of the pandemic when my son said that he was unable to play with his crane, since Kraanman (dutch for crane operator) was unable to come to work, since āall mommies and dadsā needed to work from homeā¦ so I picked up some laying around parts and made the guyās crane remote controlledā¦
In the end the relay board got hooked up to a raspberry pi running an asp.net core webservice + a video streaming service and a react.js frontend. So that the laptop could use that frontend to communicate with the backend services and the spacemouse. And, correct as you say, I did not take into account the variable input. Instead of using a relay board, feeding some mosfets with a pwm signal based on the variable inputā¦ would be better. Maybe next time 
Now, other than thatā¦ we are waiting for ages now, for a SketchUp web APIā¦