I toured Home Depot yesterday looking at possible products to use for a stand. Electrical conduit is cheap but I'm not a fan of the look and I'm worried about the strength / weight.
2x2 lumber would probably work, price is great, nice and light, but the HD stuff has joins in a lot of the boards. I fear that would be a likely weak point.
Hemlock dowel was really appealing. It's attractive and lightweight, but expensive. I wouldn't be sure what diameter to buy. I think the 1 5/16 inch might be sufficient, but I have no way of knowing without trying it out.

2 questions. 1. Has anyone seen a website that lists strength of various materials? 2. What is a good length for the cross bar? I want to hang my WBBB from it.