Thank s John.
I'm going to first take some photos of myself on the trike against a brick wall, I can then use the wall as a kind of graphpaper to get accurate enough measurements. I might try using kite making fittings and material first, as I have 3 20ft lenghts of 1/4" fibreglass rod and a roll of BRIGHT green ripstop. Depends on whether or not my sewing machine can handle the thickness, or is it whether or not my thickness can handle the sewing machine? blood will almost certainly be shed.
sprogs