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I am very glad I have this particular site! I am also into cheap shelter designs and want to share this with all of you. There is a little known but fabulous website where a french architect Alain Lobel has researched structures that are built with only equilateral triangles. I have been playing around with many models and small wood frameworks and I can tell you they are very sturdy. I think people are afraid of them since they are new and they can't figure out the math as how to come up with all the different angles at the vertices. Easy...self adjusting hubs. I do think some of the structures may be stretched too far out and would lose their structural integrity but I have been playing around with only the simpler frequency structures and have found them to be uniquely wonderful. I haven't emailed him for quite some time probably a few years but he is a very pleasant fellow. I write him a letter and then one in french via a free online translator which he prefers you send him both english and french translations. He does speak some english and likes also to communicate through pictures and computer graphics. His site is amazing and I urge you to explore all the families of the various breakdowns. My personal favorite is the 3P family. His gallery is also very interesting. His site is www.equilatere.net/ Enjoy! Rick