Why not just use standard flexible fuel hose? Its much cheaper than fabricating custom metal lines. Just make sure you get hose rated for fuel use and you should be fine. No more rusting issues, except maybe the clamps.

96 T100 4x4 - 35's, 4" SL, 2" BL, 4.88s, ARBs, custom bumper & E9000 winch, etc.
99 F-350 4x4 superduty supercab turbodiesel longbed