If you go to shapeways.com the 3D printing site, they have a Baldwin N-scale steeple cab and a Sacramento Northern GE steeple cab. People are using Bandai N-scale powered chassis from eBay for them. Honest, I don't work for shapeways. Be sure to search "steeplecab both as one word and two in order to find all results. You can also search "Interurban" to find five pages of carshells. Soon they are supposed to have SN 1005.
I tried to sell my two cents worth, but no one would give me a plug nickel for it.
I don't have a leg to stand on.