The XPB, "Extraordinary Plane Build", is termed so because I believe this will lead to a kit manufactured to a price and build speed not seen very often in the world of light aircraft. I will repeat that this is very much work in progress to develop the build system first, the plane itself is of secondary importance at this time but of course that is the ultimate aim. At anytime I reserve the right to run into a dead end, be completely bamboozled, and completely change what you might be seeing in these early days. Here I present the basic theme of stage 1, the frame construction method. Please note that I am actually building this now and as I feel I have proven each step's foundation to myself first, then and only then will I post the results. I would expect to have a freestanding frame complete by this weekend. "Freestanding" means the frame stays together by itself without and fasteners (rivets or bolts etc). During stage 2 you will see my answers and methods for fastening. I currently have everything I need in materials, extrusions, modules, braces and laterals in the factory, just taking longer than expected to set up some tooling and people.