Hi Mark,
It looks like using your dielectric material and both textures came out really realistic. I'm very glad you could use them. I think your renders are always awesome, and I'm flattered that I could contribute something that you could use. I'll have a think on how best to do stormy North Atlantic. Were you able to use the height map for displacement?

So basically you would need one or two layers for color channels (or maybe three because of the whitecaps) and a height map for displacement?

Al

EDIT: I went ahead and removed the textures since you have them already.