[WildBill]

I used a 16" chain saw to make short work of the old wood in the transom. Caution wear safety glasses if not goggles (this is a must). The saw will not dig into the hull if you keep the saw inside the transom frame after you remove the cap. This made the job extremely easy. I then removed the interior fiberglass splash well.
Next I cut the box stringers back 8" and set them aside to reuse as frames later. I also cut the keel back 6" or so.
Next I ground down the outside skin and epoxied the first layer of marine grade plywood with a wood flour epoxy paste I made up and using a notched trowel to apply to each side.
1st a sheet of 3/4" was thru bolted and epoxied (paste) using the exsisting holes in the transom. The 1/2"bolts were removed the next day.
Each sheet was bedded in a 3/4'-1" fillet of epoxy surrounding the perimeter made up of epoxy, wood flour and silica. This makes up of a thick non running paste.
Then I added a sheet of 1/2", then a sheet of 3/4". These next pieces were screwed and epoxied/wood flour (paste) to the previous sheet and then the screws were removed the next day after the epoxy cured. I applied only enough pressure to each sheet so that the paste would just start to ease out. Then the epoxy could work it's magic.
I added the fillet after each sheet was complete to avoid any voids.

Wild Bill