Check out these open trusses made from reinforced pyramids and triangles http://www.isotruss.com/technology.asp and I especially like the 2 pound bicycle frame shown in http://www.isotruss.com/gallery.asp also see http://www.isotruss.com/pdf/techoverview021204.pdf Don Clement Running Springs, California _______________________________________________ ATM mailing list http://www.atmlist.net/