Speaking from Old School experience, under no circumstance cut the sides off if this to be a runner. The chassis will emulate a banana after just a couple of meetings with big jumps. Machining may look good, but the weight saving is miniscule. Modern batteries and electronics make it unnecessary from a performance point of view too (back in the day, a good matched 1200mA battery could just about keep an RC10 at full speed for 5 minutes with a 'hot' 15 double motor...).
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