The next step was to apply a "base" primer coat to the entire assembly. I stole a trick from my military modeling friends and instead of using a gray primer, I sprayed the whole thing with Games Workshop Chaos Black primer. The idea here is to get my "shadows" for free.
After the primer dried overnight, I added some additional layers of Vallejo acrylic paint. Some full strength German Camo Black Brown, and some washes of Leather Brown. I'm debating about whether to add any additional lighter washes, as every time I add a lighter shade, the printing artifacts appear to be enhanced. As I'm modeling the pier much earlier than any of my reference photos, I also need to restrain myself from over-distressing the structure.