Hi Hasse,

It is currently a little tricky to get this one done is sd7 as there is not yet an intermediate landing feature as in SD6.
But you know life finds a way ;-).
I added a model similar to your needs so you can play around with it. It is made out several flights and landings. Stringers are not looking very well and I did not correct them yet as this is something you need to do after you are satisfied with the steps placements. You know that the stringer shapes can be corrected now ? If not,look at the new features update in the forum. There is a video showing it.

Hopefully this helps for now 

regards

Michel