Version 3.1 is finished, quite pleased with it!

No issues making weight now, sitting at 139 grams.

Very fast and solved some of the spacing issues I found on the weapon motor mount in V2.1.

It does drive inverted, but the drum catches on the floor, could be used to self-right but I'm yet to test this.

Not quite sure where to go next with this design, I might add a block just in front of the switch so that the drum doesn't catch on the ground when inverted. Other than that it seems to be working perfectly, could potentially use the extra 11 grams to add some armour to the front plates.