To all..
Over at woodgears.ca there is a print utility call BigPrint. (http://woodgears.ca/bigprint/index.html)
It was designed for woodworkers to scale drawings and print at full scale as templates for furniture. It works by opening an image to print (or CAD drawing) and selecting a known measurement and then telling the BigPrint utility to print the measurement to a certain size (not scale).
But I found it also works in reverse, I took a drawing of a passenger truck that I knew had 33" wheels and told BigPrint to print the wheel at 0.5156" (33/64 for S scale) and it did. I had a perfectly scaled print of the passenger truck in S scale.
This would also work if you had ANY image of a building and knew the front door was 36" wide. You could immediately send it to the printer in any scale you wanted.
Give it a try.. there is an eval copy available.
RichD
PS. The BigPrint utility costs $22