Wow bro, pictures would help but if I understand correctly, you've torn the entire transom from the hull sides and deck? If that's the case probably you'll have to go ahead and install an inspection port in the deck, then epoxy the transom back on and then through the inspection port lay several layers of glass over the seam to further seal it and give it some strength.
If that's not exactly what you meant then lemme know. And post some pics!

Good luck.