I've modify and improve (I think) the plugin previously made by Emmanuel.
I don't know if it's right or wrong in terms of licenses, but I did it for my personal use and some friends.
Basically, I modified the existing ones and added about 500 lines.
1. I've add poly lines for 2D representation (edges and direction)
2. After three months of study I tried to implement some international requirements in this field.
I also tried to be self-explanatory, but this cannot replace user knowledge.
So, for more information, you could read this (and many others):
https://inspectapedia.com/Stairs/Ideal-Stair-Design-Specifications.php
https://inspectapedia.com/Stairs/Stair_Winders.php
https://www.practicalarchitecture.com/b ... -staircase
https://www.zhitov.com/en/lestnica3/
Anyway, few pictures:







That's all until now. There is many more to do.