New sideparts that can be used with MG-6-48 DC-Motors: https://www.olimex.com/Products/RobotParts/GearMotors/MG-6-48/
The ballcasters can be used with these 15mm balls from Conrad: http://www.conrad.ch/ce/de/product/220759/Modelcraft-220759-Stahlkugeln-15-mm
The radhalter (german for wheel holder) parts are newly designed. They fit over the motor axles to attach the Wheels.
Based on https://github.com/makenai/sumobot-jr
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Modification made by @twtomcat