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I've taken a look at what's out there for the Tamiya 70097 gearbox, and decided to design this chassis :-) Major design features include a twin deck and parallel I beam construction for rigidity; all moving parts,including the turret mast are inside the diameter of the chassis - nothing protrudes (Frits's request); the internal beams fully support the output shafts from the 70097 - a sorely lacking feature on current chassis... and my personal favorite, an engraved protractor on the top deck. ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/cascabots-roundbot-chassis-for-tamiya-70097-twin-motor-gearbox