I have built 100+ of these type of stairs here in Southern California. Those stairs are not structurally sound at their thickness. To build a self supporting staircase similar to these the stringers would need to be thicker than the ones here. I would build 5" thick stringers for self supporting staircases. Those stairs might work if the outside stringer was attached to a wall at the halfway point.
I would add a geometric stair to the class and required handrail. Those were typically regarded as the finest and most complex stairs of the 19th century. Circular stairs are only marginally more difficult than straight stairs whereas geometric stairs required difficult stair and handrail transitions at every turn and complete, prior planning. Geometric stairs are best when the stairs are planned around predetermined handrail heights. Very few folks are left alive today who have any knowledge of what I'm talking about. I hope this changes because it was, at one time, an integral part of the trade.
@Myron Smith ... that’s training ... they learn ( hopefully ) there something for there later time on the job site ... the material / wood is cheap and it gives a good bone fire but more it import thing is the knowledge what they get there is priceless
Myron Smith yeah but wood is more like a resource. We need it that’s why we planted it that it can be harvest later and use it for so many things. And then ( in the place scenario ) we replant the same amount what we just cut off before. So that the next generation had the same amount of wood available. And close the circle ⭕️... that’s how it’s
