If you are looking for a good idea for a rad hose, I found some 1.5" silicone hydraulic line, cut to length, and then ran a hose spring inside it to help it keep shape. Works like a charm and looks good too.
I have a different plan, but link me up to this stuff just for grins.
PS - 1.5" for the lower rad hose is HUGE. I measured it at 1 1/8" ID.