I think it all depends on whether you are satisfied with an interesting "critter' based on your imagination rather than a specific prototype.
Here are two I created from a Bachmann 44 ton diesel and the SP switcher shown in a before and after photo.
By the way, the track in the photos is regular HO code 100 flex with every other tie removed (something more difficult than I expected! )
If you have access to the OGR digital library, check Run 231 for more photos and a description of the On30 branch line I incorporated into my 3 rail layout.
Jim