It's been done, but it ain't so easy. The ouriggers from the chassis will have to be moved in. Not a big deal. The big problem is that the TR4, TR4A chassis has a track that is four inches wider then the TR3. So, either you have to flare the heck out of the wings (fenders), or you have to get the "beta" wings from Revington. Those are wider to accomodate the extra two inches on each side. The other alternative that someone else did (I'll see if I can find the link) is to cut the body down the middle and add four inches to the total width.
To answer you question in one word...NO.