So really this is work in progress as I'll probably continue to improve it. Also, bit of a beginner here so undoubtedly it's all far from perfect.

The STL files aren't all the printed parts used, so you can add your own stuff onto the basic principle to your own design obvs.

The parts that need threads tapping should probably have an infill of about 60 percent. The damper mounts are M2. The TT motor clip on the wheel adapter threadings are M3. The wheel attachment screw threadings are M4. The bearing location threadings are M3 (grub screws).

The bearings are skateboard type (608). The (stainless) steel rods should be 8mm. The rods are held in place in the saddle by clamp things, and disguised by 14mm carbon fibre tubes which are glued into the saddle to hold it together as a 'chassis'.

With coding courtesy of 'explainingcomputers' Youtube channel you can control the speed (as well as everything else) in Python, and control the thing via VNC.

I used an MP Select Mini printer. As a beginner, I can't recommend it highly enough.