I just had my aft stateroom replaced with a new Dometic. I can’t remember the number of the new Freon. But the AC guy told me you could flush...
I didn’t know if what you were wanting would require a frame or not. I think Waterway Systems can help you and Chuck is great to work with.
Not sure if I understand exactly what you are wanting to do but call Chuck McTavish at Waterway Systems in Sarasota. He made all 4 salon windows...
I had 4 bladed Michigan’s on my 54 Viking Sport Yacht that cruises at 23 knots and tops around 28 with everything freshly cleaned or painted....