Boat owners deal with delamination a fair bit. Polyester resin doesn't stick to wet wood. West System has vids on it. Watch them. I like using epoxy for repairs and building. Inject epoxy and clamp, simple.
I would rate that as an easy fix,pulling the window allows you to clamp. A male and female molds, and very serious strong backs. I would build them out of 3/4" plywood and 1/2" RediRod. A jig saw and a drum sander would your friends as you make 14? identical curved plywood edges for your female mold. You'll need fewer male. Look at the mold stations on cedar strip canoes .
Not very difficult but certainly time consuming.
While you're at it, pull all the windows and corners and seal with Proflex or Stkaflex.
