Sorry, can't really identify it on the screenshots. In that 4th image? Can you explain it to me... it is pretty small and abstract. Would you mind to add another image/example for the elevator?
In fact I didn't do the elevator in the screenshots. And just from the image of the tileset you don't understand very well how to build it, you're right. So I will add a new image where there is also the elevator. I hope it is useful to you.
