Wow, Amazing! I have to be honest, I'm not using SH3D since months, I do have to try this one.
For my use case, I have a semi stair (0 to 150cm) that connects like an "S", i'll have to try how the plugin behaves (i did on my self with blender months ago).

My stair is white steps-structure + glass wall handrail, so will not be exact for sure, but i'll try to do a test!