This page contains photos and short descriptions of what modelers have done to create a unique locomotive, given some commercial base model. If you have such a model and can take a digital photo or two of it, feel free to contact the webmaster. Click the photos for a larger version.
According to Paul Vaughn this model's inside frame matches the Southern Pacific's engine's frame in an S-scale model from the forward axle to the rear driver axle centerlines. So, it could be good for an Sn42 locomotive.
Converting one of these to S-scale requires NWSL #2721-6 shouldered 3mm x 1.031.
Below, is a photo of Brooks Stover's S-scale 3-truck Climax #4 of the Elk River Coal & Lumber Company, which he constructed by modifying a Bachmann On30 2-truck Climax. The conversion involved re-gauging the trucks, fabricating a new cab and coal bunker, and scratchbuilding the tender. S-scale details, such as the whistle, headlight, generator, and air pump, were also added. A complete description of this conversion was published in the November 2014 issue of NMRA Magazine.
He also built a 2-truck Climax using similar techniques. Construction of this model was described in the May/June 2013 issue of the Narrow Gauge and Shortline Gazette magazine.