the plywood is a relatively minor investment
The plywood is not expensive , the shipping is
A last tought. If you could get okume veneers, it would be relatively easy and straight forward to make your own high quality plywood..
Rolf, I think you just found me a good solution <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />
I was told that a good way to know if plywood is suitable for boat building is to take a piece of the ply and put it in boiling water for an hour, then dry it in an oven with high temperature for 2 hours, then do this procedure 2 more times.
if the plywood layers are not separated then it is suitable for boat building.
I ran this test on several kinds of ply and only one passed,
it was birch ply, the problem with birch is it's heavy weight.
The question is, can I use 3mm birch ply instead of 4mm okume? will it be as strong?