click on the link to the old web site. there is a box structure to build on your work bench that will hold the top longeron and side tubes for the cabin area until you can tac weld them in place. It is not in your plans. You remove it once it is tacked up. Or go to you tube and search for Jeremy Dunn videos. He has put videos up for building the LEU and the double eagle. Step by step on how to weld both fuse assemblies.