I did the job you described with the deck and transom last winter.
I've put details on here - Searider rebuild project
If you have any questions about anything I did feel free to get in touch.
The boat has worked out great. It's so much quicker to get on the plane and uses much less fuel with the flooding hull blocked off although it floats much higher so gets blown around more at low speed but not enough to cause problems.
Project for this winter is a retube and reflowcoat the hull underside. I've done all the hard work though!
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