OpenForge 2.0 Cut Stone Spiral Staircase 4x4 internal up & down

This is a remix of the OpenForge cut stone concave curved wall and the corner spiral staircase by Start2. I built this for the stairwells for my attempt to build Castle Ravenloft entirely with OpenForge tiles. Sadly, nobody has much that I need in the stair department. Once again, necessity is the mother of invention.

Hoping someone else out there will find this useful to them.
A special shout out to Devon Jones - Keep up the amazing work!