Re: Transom height
Yes and no! It is possible to cut down the transom and I have seen a couple of shoddy workmanship jobs and a couple of nice ones. However, cutting it down will compromise the strength some AND a 15 inch transom will lower the rated horsepower the boat can handle. Then, if you ever do replace the engine with a long shaft, you will need to repair the transom.
It would be a better solution to buy or make a jackplate to adjust the engine to the hull.