Looking through the current issue of Specialty Fabrics Magazine, there were a couple vendors that carried equipment that could be put to use theatrically. The first, Cole Tech carries an assortment of Marine rigging hardware, mostly rings, webbing adjusters, and hooks. While they don't have alot of a selection, I think that it would be an interesting or helpful practice to use triangle "rings" instead of normal "D" rings. This is one of the good points of the "delta" hangers that Mutual hardware sells.
The second, Lowy, carries webbing, a variety of fasteners, hot cutters, and robes, including bungee cord.