Castle Turret with Spiral Staircase (18/28mm Scale)
So this pushed the limits of my CAD workstation with its support. I know, it's not...elegantly designed. This is more an experiment.
NO clue if it's printable or stable. The ZIP file has the fully supported editions with texture and modeling in OBJ and STL. They are, however, huge. The OBJ at top is the non-supported, non-modeled for your pleasure.
The cover image is a Project Felix blend with a painting by Zdzislaw Beksinski and it's probably not so hot looking. Again, experimenting.