Yeah, that's what made me think of it, actually. I just didn't know if that frame was welded chain or if it was forged into that shape. I might still try it, but I'd have to be meticulous with the welds.
In the meantime, I think I might just use EMT conduit. Does anyone know how easily you can bend that pipe after heating it? Maybe I'll just have to butcher a beach cruiser.