From the reading/research I’ve been doing I think the Alpha One requires 2” to 2 1/8”? I’m planning on grinding out the whole transom on the inside after removing the engine, V’ing the crack on the outside, reinforcing with 1708 inside, filling on the outside to level, and gel coating the whole back.
I’ve been watching Archbuilder’s videos on his SeaCast transom and considering that route to rebuild once the repair is done, if the cost of that is too much then Plywood, resin CSM, and 1708. I’ve been lurking and reading as many rebuilds here in the last two weeks as I can find that are close to what I think needs done.