Chassis for Tamiya track and wheel set (and gear box) and arduino

Removed the basically random mounting holes, in exchange for risers (printed separately and acetone welded in) in a pattern for holding an arduino mega, as well as 6 risers near the front for various things.

In the images, not all the risers are installed, and only one battery holder is installed.

Acetone welded two battery cases for 18650 batteries, one on each side, such that they sit primarily between the tracks. 2 acetone welded supports help keep the holders in place.

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