OpenForge 2.0 Corner Spiral Stair Up and Down OpenLock Base

OpenForge 2.0 and OpenLock
Still continuing upon a theme.....A roleplaying terrain feature/accessory to depict the middle of a spiral staircase going both up and down, as in a mid-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 only on the 2 sides of th