Your Beachcomber looks great! Wow!!
We just bought a 76 Beachcomber and would love to do something similar but really don't even know where to start. Any advice you have would be great. We still have the dark brown interior that we would like to replace and the rear window needs to be replaced. Did you replace the windows yourself?
For the interior, save the wood panels if you remove them as you will need them to use as templates to cut new ones. The windows
can leak from two areas - the space between the aluminum frame and the fibreglass, and between the plexiglass and the plastic strip that holds it to the frame. On ours I resealed both, but the stripping between the aluminum frame and the fibreglass was leaking the most. If you want to replace the plexiglass, a glass shop can do it or a home building centre may sell the plexiglass.