Looks really good Steve, BIG!
I suggest just painting the planks by hand. I start with a base coat like you did, in my case usually USN Light Gull Gray.
Then I get a short straight edge like the little 1" x 2" anvil from my punch set.
I pool out four or five colors of acrylic on a piece of blue tape, my favorite disposal palette.
Like Radome tan, Wood, Leather, White, maybe one of the German yellows.
Dip the tip of a toothpick in one, Put your straight edge down on the deck, use the molded lines as a reference and pen on a 1" (30 foot) line. Do a whole bunch in one color. Just watch not to puddle at the put-down spot. By the time you've done a bunch of deck, go back with another color.
At the end I put on a layer of the base color really diluted, barely a tint.
I like the results and its a lot easier that masking around all those bumps.