Round Spiral Stairs are different than other Stairs. See Step 19 for guidelines.
Use SVG in black and white size 80x60 px as Icon
Never use Mirror-tools when creating items for the Planner
All models should follow the naming convention and structures defined in Replace Material and Object Names
All Object Names need to be correct since the names will be used in future versions of RoomSketcher
Note: Test 3D model both with and without riser to see if it will be compatible with the version of RoomSketcher that will hide riser, the same way as we hide railing