The above website has some great points to mount a body but what I like to do is remove all tires and rear gears and set the chassis on a flat surface or even plywood on saw horses then proceed with fastening the side pods to the nose. Once fastened I will fit it to the chassis and align the nose with the center of the kart all while making sure my spindles are centered to the cutout for the front tires which I have noticed is usually the mating joint of the body and then mark all the mounting holes with the sharpie. After mounting and moving kart to a stand, install wheels which may require you to trim the bodywork and also verify there is no steering obstruction and also trim as needed to clearance. Hope this helps