Part 5, june 17th, 2017:
We can now assemble the second stair. Please take notice that some parts for the second stair mutually otherwise must be assembled and that the bottom wide stair step only belongs to the first stair.
In the picture all the parts for the second stage.
For the stairs from the first to the second floor, the triangle slat must be glued at the top of the stairs curve (step 23). later on the stairs will be glued on it. The stairs end post can be glued in the same way on the stairs bend (step 23). Let this part dry for at least 45 minutes.