I did some research and looked at other forums that talked about just that item. I googled it, and there was one thread that a guy talked about a motor upgrade from the 90hp his boat had to a 130hp. The plate on the outside would have to be a horizontal brace while the inside would need to be both a horizontal and verticals brace. I think it is something I could do with the metal I have at my house. I could take the plasma cutter to cut the outside to the correct size that I need. While on the inside cut it to a much larger piece to cover vertical and horizontal. Then I can always paint them with several coats of primer, paint, and clear coat to keep them from rusting. After installing them epoxy around the edges to seal it from the elements and bodies of water, and finally epoxy around the bolt holes.
This will be a very interesting project to try and see how it works. I think if it's done correctly it should be able to handle the thrust of the motor. If all else fails well a new transom would have to be built and installed. I have hope for this plating though. I'll probably start working on it when I get home Saturday.