Chris,
The DT hub is much wider than the OC or SW5, so you don't want that if building a road bike with a brake drum. The OC & SW5 used the standard hub as per the 600EW, S6 and derivatives, the mid-thirties heavyweight models, and the Aero models. It was also used on the lightweight models from 1931 onward (and some earlier than that). So quite a few potential donors.
-Doug