I used a chain saw, drill bits, scrapers etc to hollow out my 1979 v20 fisherman transom last year.
I used nida-bond pourable.
Advice: Take your time. Get the mush out. Then let it sit for a day. Then go back. The wood will soften.
Don’t go crazy, but make sure the top layers of plywood de-lam from the skins.
The stringers don’t attach to the transom on my model.
Use a hose, fill the cavity. Look for leaks. Glass over these leaks. The pourable compound will find them and flow right through. Aluminum ducting tape can work for small clean holes, but if its in a rough/faired area, just glass over. Or use a quality fibre putty.
fill to the main height. Then cap with glass. Fill both sides. Cap again. Work your way up as high as you can. It finds a natural level.
It works well! Just don’t look @ your stringers. It will make you want to tear the whole boat apart...
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