[Gdeaver]

You can get 5' sections. You should use 1 piece for each section of the arm. Do not use normal metal techniques. Avoid drilling holes in the pultrusion. Clamp things onto it. For where hinges and joints will attach to the ends, bolts can be embedded in ends with filled epoxy. Tube in tube construction works very well to reinforce the ends where the major stresses are. You'll need some laminating epoxy, 2 Lb 2 part urethane foam, 1/4" chopped carbon or fiberglass. Try to avoid imparting stress on a single point. Spread it out over an area. We made our arm out of fiberglass last year and it was amazingly strong. The arm weighed 23 pounds complete with motors. If it was aluminum, we calculated it would have weighed 44 lbs.