On 29 Apr 2007 07:43:31 -0700, Chuck Gould
wrote:

So there was a lot of plywood used in the construction, but the hull
itself was double planked mahogany.

So it seems. I'd always been told that they were built entirely of
plywood but that doesn't look like it's entirely true, and it
certainly makes sense given the conditions and speed range that they
operated in.