Here is the start of the work toward raising the transom to make more room and to help keep the sea out a bit better than original.
Every single crack, hole and even a blister has been ground out. I even found the remains of mild steel screws in a few holes! The inside at this stage got 4 layers of triaxial alternated with 4 layers of chop strand mat. When this portion was completed the rear wall was almost double the original thickness. The result was an extremely solid rear wall with none of the floppy wobble of the original bare skin just a very solid structure ready to be built on.