Phill,
I am looking forward for that call, (sent you a message)

This is data from "The gouageon brothers on boat constraction" I almost forgot I had this book until Rolf mentioned it, Thank you Rolf,
This is a great book.


More resources:
http://plywood.e-boat.net/plyhelp.php
http://dixdesign.com/woodimp.htm
http://www.resourcesintl-wa.com/properties.html
http://www.westsystem.com/ewmag/18/pdf/plywood.pdf

If I use Birch over Okoume The Weight of the hulls will increase by maximum 6 kg (13.228 pound) minus the weight of the leftovers after you cut the ply.

How bad is that?
I need to find a way to reduce the extra weight some where else.