18' SF with soft transom

[rayhawk]

Hi Guys, I have an 18’ 1978 seacraft that has a soft transom. I fabricated an aluminum bracket to tie into the solid part and have been running it for about 10 years this way. It is pretty solid, but I have always wanted to fix it properly. I have experience with fiberglass, replacing decks, etc, but am not sure of the best approach to this job. I feel that, ideally, the inner liner would be removed to allow scraping out the rotten transom and glassing in a suitable replacement (what do people use nowadays in place of wood for transoms?) This would allow the outer hull to remain untouched. This is the type of runaway project I would like to avoid though. Is there a solid way to replace the transom core by coming in from the outside? I love this boat but would really prefer a 20 or even a 23 seacraft.