Re: Deck coating / Turned complete restore
What are you going to do w/ the transom skin once you get done w/ put back? Gelcoat? Paint? Nothing?
The newly installed plywood transom is covering the inner surface of the proposed mount locations, correct?
If you have to do any repair work or touchups on the exterior transom, I'd consider cutting the one closest to the center of the boat off. Done in such a way that you could build a plywood wedge to install against the back of the transom plywood, after you wrap it w/ CSM & PB it in place. Then put the removed piece back on.