regarding window replacement. I did is on my GB36 483 from 1976. I ordered alu frames with double glass. I removed also the back entrance master bedroom and also installed a alu door en sliding panel. I live in Belgium and we travel a lot in Holland. We have a lot of rain and now the window leaking stopped. Still you need a very solid alu window because when the boat is moved out of the water the hull allways moves a bit and that can cause leakage from window.
We have a inner and outher frame that comes together with screws. Maybe 500 pieces for all the windows. I can send pictures if you like.
Sam
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