Small update - but potentially crucial. It really bugged me that the motor's wiring lugs and sensor connection were unprotected from impacts and crashes - one bad hit against a fence, wall or another trackside object in the wrong spot and the motor is done for.
Now I could just have made an add-on piece to solve this, but I thought I'd try and make use of the flexibility that the printed nylon offers to (hopefully) make a slightly more flexible bumper - but as it's mounted on both top and bottom still miles stiffer than the original small bumper I had printed
The side plate should offer some protection in a crash - yes, forces may still be transferred and the plate might sacrifice it's life in a really bad situation, but then at least my motor still works

It's not the most elegant solution, but for now it'll have to do - it's too much work to make add-ons look nice that might not work at all