The common drawings like the one sold on Ebay and the ones on the Wescott site are basically the location and size of the holes in the frame. If you need the channel cross sections, such is not readily available....we have searched for three years for such and had to do our own CAD files (which are not true 1932 rails). The frame manufacturers have patterns for their plasma or laser cutters that would give you the dimensions that you need but you probably wont get them to give them to you. You might get a frame mfg to cut you a set of rails from stainless....if you really need them.....the best question is "why stainless?" Have you researched the strength of stainless vs normal steel? The cost? The weight? The weldability? If you want to do stainless for appearance sake, you might look at coatings to achieve the look at a lesser cost.

Good luck

mike in tucson