Trying a way to get tires and tracks.
Acidic silicone sealant + charcoal + water.

stl files of models of molds and parts of the platform: https://www.thingiverse.com/thing:498...
platform control code on github: https://github.com/TrashRobotics/Trac...

The main parts of the test platform:
arduino Nano v3;
bluetooth module HC06;
motor driver MX1508;
yellow arduino TT geared motors;
2x 18650 accumulators and battery compartment for them;
toggle switch;
board or piece of plywood 190x80 mm.