The wall set I had been sculpting was taken back to square one. These earlier pieces (the ones I posted pictures of a couple weeks ago) weren't working for me. Since they were sculpted from a relatively flat section of putty over the MDF core, the stonework wasn't giving me the difference in depth and angle in the stones that I was hoping for, and the placement of the stones didn't match on the reverse side.
These new walls were made by placing and sculpting individual blocks of putty, and I'm much more satisfied with the result.
The stones are sculpted from Aves Apoxie® Sculpt, and any deep gaps between them are filled with Brown Stuff modeling putty.
Here are the two side-by-side:
The wall posts use the "skull shrines" I previewed on Facebook.
One of my pet peeves when it comes to wargaming terrain is wall sections that don't properly line up or "join" at the corners, or that don't have proper "ends." I've designed these so the inset skull shrines are recessed enough that the walls will insert into them and link the segments together or form corner posts. The wall posts can also be used as stand-alone elements for the bases of a statues or monuments.
I'm working on the tops now. I've kept them as a separate part for ease of molding. Any significant "lip" would be difficult to pull out of the mold, or might have bubbles, ruining the whole wall. I can also make different wall toppers (flat stones; spiked fencing, etc.) to provide more variety in the future.