Check out my page from last summer where I experimented with plywoodboards at LOW cost, it´s in english (kind of

)
goto
http://www.red-dot.dk (under "boardmaker", but also check the "videos" section for lots of kitevideos)
ps. here´s a little movies where the plywood copy of wipika apocalypse 140 is tested. It works great actually!
http://www.red-dot.dk/vs.wmv
Regards
Alsbirk