So last I left you I had primered test wall #2 with cheap black acrylic. It's easy to see below that it's much harder to hide the PVA under the skinnier balsa wood.
The wattle & daub dry-brushed with some greys and a white.
The wood was done with browns mixed down repeatedly with light ivory.
I still need to weather the door pull. Probably just dry-brush with silver.
Here's a comparison between the first and second test walls. It became pretty obvious the foam core has a grain to it. I'm not sure which I prefer looks-wise, but the horizontal seems less resistant to warping.