Thank you Cappy and all the comments. I'm doing the same things to my '83 Sunrader 21' w/rear door. 55K on it. I bought it with everything taken out. Just frame and insulation. Super light now. Front windows where fiber glassed over by a marine company, so no leaks there. I am rewiring as just an isolator under the hood, and one battery. Will be putting 2 or 3x100W solar panels on roof. In WA not much sun, but it is good when it is! Thanks again for all the info, exactly my questions also.