Yes, I agree that the chassis has to flex a little. Not to be a smart ass... But yeah, figuring out what causes the chassis to snap would be a good idea! ;)
My point is that there is something specific to this design that makes it unusually EASY to do.
ERBE: RCM 1/8 Hybrid Diffs, NEU 1515/2.5d/S MMM, 6S, Losi E-XXL CUSTOM, Neu1515 2.5d, MMM, 6s E-SLAYVO PRO ERevo Chassis w/ Pro 3.3 parts, NEU 1512, MMM, 4S.