I mark this as one of my better failures. Some things worked out alright like the difference in shading on the top vs the underside but overall it really isn't one of the best models I've painted. I consider it a failure partly because I messed up the gold by making it too bright and was too annoyed to properly repaint it to the reddish tone and partly because I assumed I'd already cleaned the model and found a bunch of flash and other imperfections after I'd already primed it.
My goal here was to pull both from the eldar and necron influences to come up with something that was a bit different than the typical BLACK blackstone fortress. Hence, the interior is a reddish metal and the exterior is more of a bone color. To achieve the namesake black stone, I decided to leave the capstone of the pyramid black. I may yet go back and adjust a few things but here it is.