When you build up a rolling tower a good start is half the work. It can be tricky to get the first two frames erected without help, because the brace is turning around the rung. There is a solution for this problem.

How does it work?

Click the horizontal brace to the leg just above the bottom rung instead of on the rung itself. Then leave the other end of the brace on the ground.

Repeat this on the other side of the frame so the frame rests on two horizontal braces.

Now you can place the frame on the other side and click the braces on the legs of this frames. Then attach the diagonal braces so the base of the rolling tower is steady.