OpenForge 2.0 Corner Spiral Stair Down OpenLock Base

OpenForge 2.0 and OpenLock
Closing the loop.....A roleplaying terrain feature/accessory to depict the head of a spiral staircase going down, as in a top floor corner tower. Vision was a staircase tower protruding past the corner of 2 walls. As the link needs to be in the corner to properly set this up, the stairs only include a 2x2 base EB (non-standard) to link the standard tiles.

Will visit and include (here) the standard E connections on the 2 sides of the stair entrance, as the back sid