Here you go...
But instead of putting the effort in to making a box, I would just grind your front stub axles flush with the nut and you'll be fine...
23.3 The dimensions must conform to the following:-
Maximum length - 460mm inc. bumpers
Maximum width - 250mm at any point of suspension travel in a vertical plane.
Minimum weight - 1474grams for 2WD, 1588grams for 4WD complete and ready to race. The minimum weight(s) include fixed Personal Transponder but exclude Auto-powered (hand-out) Transponder.
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