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What material are you planning on using?
My buddy made a hard top for his F32 using 1/4" Starboard on Aluminium channel supported by stainless tubing from bridge surround.
One thing I like about yours is the rigidity you should get from attaching it to the windshield.
If it looks half as good as you photoshop work it will be sweet.
Michael
Rum is the reason Pirate's have never ruled the world
Done Dreamin'
1987 President 43' Twin Lehman 225SP Turbo
Highfield 310 Ally 15 HP Yamaha 2cycle
1978 F32 Sedan twin 318 Chry SOLD
Safe Cove Marina, Port Charlotte, FL
My thought process is to keep it as "marine" or factory appearing as possible.
3/4" square thin wall aluminum tubing for the hard top sub structure...welded.
Including the underside rails that the camper top and upright supports will attach to, and the aluminum support that will rest and fasten to the windshield.
Thin walled so that the tubing even being square can be curved to mimic the cabin top shape. Then between the ribs or cross members tightly fit 3/4" stryro foam so that the entire hard top takes on equal thickness.
The same for the two uprights. The uprights and supports will have the mounting hardware in place before the fiberglass work begins.
Then apply two sheets of fiberglass and resin covering all surfaces top, bottom, sides, edges & lips.
Sand and shape...then 3 or 4 coats of filling primer.
Sand smooth and paint with Interlux Brightsides, to match the topside I am doing April.
Of course there are more details, but that's the basic plan.