... The steel prefab shed in the picture we can design, manufacture ,install in 1 month . Our company ... city of China. Since 2001, we began to design ,manufacture, install all kinds of steel structure buildings ... . If you have not drawing, pls don't worry, we can design it according to your requirement till you ... , tension rod ,crane etc. 4) How to order Design Parameters 1) Live load on roof (KN/M2)2) ...