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How to design a compact, low-center-of-gravity body for a 3–5 kg metal robot soccer chassis? Seeking advice

A developer is converting a cardboard/wood prototype into a metal chassis for a 3 kg–5 kg class competitive mobile robot, planning to first use a single base plate to mount 300 RPM Johnson motors and BTS7960 drivers. Their core questions are: how a small 300 mm×300 mm-class metal robot can achieve a compact body and low center of gravity to hold off heavier opponents, and whether a 100% invertible robot should use a base plate + standoffs + top plate sandwich structure or a bent sheet-metal shell. They also want prototyping methods for converting the cardboard model into aluminum plate cutting and drilling dimensions to avoid mistakes on the first machining attempt.

Part of the event: Developer Seeks Advice on Compact, Low-Center-of-Gravity Design for 3–5 kg Metal Robot Soccer Chassis

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