The xxt wheels were pin drive on the rear and had wheel mounted bearings in the front, same as the xx. If the xxxt follows suit with it's buggy varient. Then the front wheels would be hex drive I believe with the bearings in the knuckle. I can't tell you if the offsets are the same though.
Shell wise, have you tried looking for a period shell from the likes of Parma? Of maybe even AE, if they happen to do old Rc10T shells still. Hope to have been some help.
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