A chassis and mounting system for a small rover/robot. The length is configurable based on the balsa wood shaft used as the backbone. Was used as the structure of a line-following robot. Plenty of zap-strap holes are included on the chassis for "neater" wiring. Two motors with the normal servo-esque form-factor may be mounted on the chassis; stand-off spacing on the chassis fits the hole-spacing of an arduino UNO. A spring-loaded battery case can be mounted below the chassis, fits a certain cellphone battery size (modelled to fit the one battery we happened to have on hand). Sensors and other circuits may be mounted to the balsa shaft. All parts included are printable without supports (though with a bit of bridging). The holes and captive-nut holes are sized for 4-40 screws/nuts + some extra room for printing margins.