Hannobal - Spiral Stairs

Since I was a bit unhappy that staircases take up a lot of space on my ships and stations, and I found AViegarien's stairs a bit too narrow and compact for my purposes (excellent work though!). For lack of alternatives, I started to create my own stairs. I'm quite content with my result, so I decided I might as well share it with you. Here's the basic info:

• 8 (very similar) square-cut variations:
• [list]
• with or without rails
• blocky or curved bottom
• overlap at the bottom or top [/list]
• 8 (very similar) rounded variations:
• [list]
• with or without rails
• overlap at the bottom or top
• with or without a rounded window (also available as separate block)[/list]
• designed to be compatible to the 2x1 vanilla stairs
• fully supported mirroring
• 2 construction models
• 3 LOD models
• recolorable

Note: The collision models are rather complex (up to 54 faces / 72 triangles), but with a more simple design (i.e. sloped planes) you could only walk on the outer edge of the stairs and I found that too inconvenient. So maybe don't use the stairs excessively.