Well I got myself into a proper state over the last month or so fretting over how to build her. I went down the 'mould your own' avenue........far far to expensive and complex for me, so aborted those plans. Back to the drawing board (computer), full length hull........no, far to big, prone to distortion, difficult to store, handle, launch, transport etc etc. So, going down the 2 halves route, plank on frame, glass in and out. This lead me to redraw the plans, again. 75mm between each frame, 9mm ply frames. 18mm ply bulkheads at joint to allow for jointing bolts. Going to use 10mm threaded pipe that is used on lamp fittings, this will go several frames deep into each half, locked onto each frame with washers and locknuts, this will allow an 8mm threaded rod to be passed down each tube and this will bolt on the inside of the opposite end bulkhead of each hull half. Along with lengths of 20mm plastic conduit fitted into the bottom of each frame for as long as possible in each half, these will be bonded in place to allow lengths of 16mm stainless bar to be inserted before each half is bolted together, this should act as both ballast and support for the full hull when joined. Hope you can follow my ramblings, pics will follow when available.
Questions now.
On planking, would it be better to double plank it? What thickness would be best for a beast this size? If doubke planking, does it need sealing after first layer?
Deck thickness is next, there is a slight camber on her deck, albeit 1.8mm, call it 2mm for arguments sake. Thin ply 1.6mm? There will be plenty of support. Or thicker, if so, how thick.
Sorry for so many questions and delays but I want to get this right.