12mm waterproof ply - as in not Marine Grade, but close enough.
Strapped it to the work bench, wet it and ironed the crap outta it (owe my sister a new iron now!) this gave the board a little bit of rocker, I'd say about 10mm, just enough really..
Made some fins out of a chopping board from the kitchen, used the base plate and straps from my old board which was a faily simple process, drilled straight through the boars and put those threaded T nuts in the underside (just visible in the pic of the bottom of the board below) pulled a handle out of an old lancer I think, as seen in the top pic below...
Top:
www.seabreeze.com.au/gallery/gallery.asp?imageid=3110 Bottom:
www.seabreeze.com.au/gallery/gallery.asp?imageid=3111 Overall I am pretty stoked with the way it rides, only change I'll do when it's time for Version 0.2 will be not having the chiseled ends of the board.... they sometimes catch the water and send the board for a dive.... once you get used to it tho it's ace! had a mate ride it too and it worked for him too! So I'm not kidding! over all the board cost under $100 to make!
and does it perform like you thought it would 
what a sweet looking ride . and the use of end grain balsa as the core is a great idea . how much glass and carbon did you use
