I think we're getting ahead of ourselves here folks. Forget fenders, components and what color the thing is going to be, what about the most integral component of all.. the wires.
I'm very curious to see how this turns out, very cool project, this is the kind of stuff I like to see.
How are you going to properly tension the wires? If I were you I would select a wire with a much higher tensile strength than what you'll actually be tensioning it to, like a safety factor of 3. If one of those were to snap, it'd probably be pretty ugly.