Did the requirements specify Wood as he build material?
Are the requirements only max min length, C02 placement etc?
I had a very good experience using bits of brass tube and square tube which I found at ACE hardware(sorry for the plug but that was the place)and epoxy. My biggest problem being...
I might be a wrench monkey but I've got the stars in my eyes. Here are NASA's "Human Rating requirements" javascript:openNASAWindow('http://nodis3.gsfc.nasa.gov/library/displayDir.cfm?Internal_ID=N_PG_8705_0002_&page_name=main')
I found it here...