jeff, have you heard of Taylor Distributors? They wholesale to cabinet shops if you know anyone in the biz or can find a cooperative shop. I'm not sure if they have okume but they have lots of weird wood and might at least have marine grade luan which should work and may even be cheaper. Might be a good idea on a first boat. (heh) Danged if I can find a web site for them but I know they exist. Heck they deliver from Gainsville to Ft. Meyers! Might be worth a look see. If you want, I'll try to find their phone # next time I go to the shop. Which'll be tomorrow.
Rick