On Aug 24, 10:33 am, (Richard Casady)
wrote:
... How is cored for home building? ...

Very good. For one offs it is about as cheap to build cored hulls as
solid glass on male tooling and cheaper than solid glass on female
tooling. There are many strip-plank methods that involve laying
strips of core over bulkheads (typically produced with a flat panel
cutter) and then glassing. These methods eliminate lofting and
greatly reduce tooling. Done well they do require a lot (really huge
amounts of back breaking horrible work) of fairing after the planking
stage otherwise they will need to be heavily bogged to get them as
fair as traditional female tooled boats. There are other methods like
(http://www.kelsall.com/methods.html which I've seen used with
impressive results) that can cut down on fairing. Of course, the job
really starts once you've turned the hull over. Fit-out costs are
pretty much unrelated to the hull construction method and for a
typical cruising boat the great majority of the work and cost is fit
out. The hull may only represent 20% of the completed cost of a
nicely fitted yacht.

-- Tom.