I think you are understanding what I am getting at.
My DIY article would be pretty simple. Start with straight tubes and straight trees. Then turn, tighten and re-tighten somemore until it is all straight. Even slightly different torques pull things this way and that. A 2X4 might be faster but I do without that or the block and tackle. It's simple and at the same time complicted in a way if you get it down to minute details. You just have to F with it. Sometimes over and over and suddenly it wil be right.