So yes I'm done. Yes, I managed to do it when all seemed lost!.
I went to the site this afternoon, to take the real sides, (hourly) because it didn't exactly correspond to what the arisant had taken. In addition, the house is not a mess but I am sitting there. (I hope).
So it looks like this:
As for the 2D plans I made to draw each step seen from above, here is the detail. Explaining the whole thing would take a long time, but that's the method
Is the leg you added under the stairs a constraint of the client? I would have taken it back on the wall to have free space under the stairs. This is for practical cleaning reasons.
As for the leg, I put it like this, because from the living room it will be hidden by the main beam (the small one at the bottom). But I like the idea of putting it directly fixed in the wall in front of it to make it easier to clean. I will talk about it to the craftsman and future customers.
I also added it, because at the top, I only have 100 mm of wooden beam appeaser (Alsatian house obliges) to fix this staircase. That's why I told myself that putting my foot like this will relieve the high fixation point a lot, right?
Since it pleases better :-) I'm adding screenshots, because I also added a ramp.
Now I've finished everything.
A+ and thank you for your feedback, advice and others.
Expand the unfolded config and see if your folds are not removed in the parts that don't unfold. It happens from the livers... All you have to do is reactivate them...
I don't know why I had removed a part by extrusion, but it didn't want to take so I had to tinker with something (I don't know what) and that's why these two steps didn't appear unfolded. Everything went back to normal.
Ok perfect, we should still think about closing the post by validating the best answer and moreover there it is finished and ready to be put into production. ...
I put you -1 because I don't think it's correct. One of us (PL or gt22 or myself) deserved to have the best answer for having helped you in the development of your staircase and not validating you....