That looks wicked cool Rob
OK, here I go with the base, this will be the first time I try this method.
First I made the base out of an old piece of house siding and made poster board walls and used hot glue to attach them to the sides. I also stiffened the walls with some cardboard backing.
Then I placed the ship inside the box and laid in sawdust, and formed some crests and troughs. I then squirted some thin CA onto the sawdust to stabilize it. That worked remarkably well but use an enormous amount of glue.
Once dried, I applied Mod Podge for a base for the acrylic gel.
I will use the acrylic gel to form the wave peaks and smooth the texture. After the gel will be applied, I'll paint dark blue mixed with turquoise at the foam. After the paint will come the cotton, but I'll show that when I get there.
That's all for now.
Steve