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Someone on the facebook group asked about how to install a flat fitting in a round tube. I recommended tinmantech.com and their 2 dvd set on building a 4130 tubing airframe if you are scratch building your first fuselage. It has been so long since I built my fuselage and tailfeathers, that I had forgotten about this great resource (when I bought the videos they were on vcr tapes). They provide great information and very helpfull tips for forming and welding a 4130 structure, including answering questions like the one posted on facebook. I found it very helpful in my build. The set is quite pricey but there is also a rental option.