Sceptre transom rebuild

[Entourage]

Started my transom job today. As i was cutting it out i realized that the guy that i had do it 4 years ago used pressure treated wood. What a "No No" that was. I was worried that the oil in the pressure treated did something to the laminate so i pulled both inner and outer out. Not my plan. He did not go all the way up either as you can see in the photos and all the top was completely rotten. I have three months to get this done cause i want to go back fishing.Try to get photos not used to the new method files are too large. What is the trick