It looks like this thread has about ended, so perhaps I can make an hijack attempt..

Are plywood hulls for an A-cat still feasible, or has the minimum weight dropped too low? What if one wants to put a spi on it?
What I am really asking about is: Is it still possible to build a somewhat competitive plywood A-cat at home (I know there are building descriptions out there, and photos, but will they be competitive on a local/national scene).