Answers to posts since my last one.
The race proa iscoming along. Hulls are done, temporarily stopped the mast construction to check out a different rig concept and build method on my 25'ter.
Unstayed masts work better on cats than stayed ones in terms of ease of use, maintenance and safety. Either a ballestron if you can't get the mast far enough forward, or a biplane with wishbone booms. Lowest cost would be a single mast in one hull.
Your bulkhead landing drawing is pretty close. Works best with a box mould so you can line them up pre infusion, which is simpler than with a story pole. Almost impossible on curved hull sides sides or bottoms, dead simple on flats. Gluing area is increased if the edge of the bulkhead is glassed.
Stack infusing works, but it means secondary laminating and extra prep, so overall takes longer. It is quicker and easier to add all the extra reinforcement, rebates, etc in the infusion. The object of Intelligent Infusion is to eliminate all secondary laminating. We are not quite there yet, but getting closer.
Resale value is interesting. A 50' racer cruiser cat is for sale here. Well known designer and builder, sales quickly and well built with all the usual gear required to make it perform. Cost 1.3 mill a couple of years ago, asking 800K and no takers. So, at least a 500K loss. You could build a C60 for less than 500K, including your labour. Lighter and longer so probably quicker, certainly easier to sail. If you sank it instead of selling it, you would not have lost any more money than the expensive boat.
Open deck or full cabin: Consider how the boat will be used. 8 permanent bunks is pretty pointless on a boat that 8 people cannot live on, and if there is nowhere for them to comfortably sit while sailing. Dining table and galley should be optimised for the number of guests that are likely. Flat deck space is great if you are standing, uncomfortable if you are sitting. Shade is important in the tropics, shelter is important wherever you are, but you have to be able to see the sails and as much horizon as possible.
Eliminating stuff: Get serious about this and you end up with a harryproa.
There is a larger variety of hull shapes possible with box moulds than with flat panel builds and more other shapes possible with core less areas than with solid panels. Have a look at the exploded drawing on http://harryproa.com/?page_id=1177
Each colour is a separate infusion, apart from the purple, which is 2, as are the beams. Furniture is another, Apart from a small amount of filleting and tabbing, all components are glued together, in male/female self aligning joins. Fairing is minimal. Tear off the peel ply and most of it is ready to paint.
It is no problem to build things with plenty of compound curves, if you don't mind the time consuming wet laminating, tabbing and fairing.
Round bottom hulls have less wetted surface than flat, but the work required to build them and install floors is huge. The added weight and windage to achieve headroom and give you something to stand on more than outweighs the wetted surface issue.
Finished bulkheads should include doors, hatches, edge finishing, hard points for handles and hinges, additional laminate in stressed areas, landings for shelves and floors and rebates for fittings. Few of these are possible on a flat stack infusion, so have to be added after the shapes are cut out. Which is not a problem, but you are back to conventional, time consuming, sticky boat building.
All these features are included with Intelligent Infusion along with rebates for cloth overlaps, so fairing is minimal. A caul plate can be added if you want it flat and shiny, as can veneer or finishes like formica or woven carbon. You spend a little more time laying out the infusion (dry materials, easy measurements) but no time with the wet sticky stuff.
If you can infuse everything in one shot, cutting fibreglass panels and wet laminating make no sense.
Adding flanges to the bulkhead is easy on one side, not worth the effort on the other. It is much easier to include the landings in the hull infusion, then glue the bulkheads in.