I started with a 1919 Ford model T chassis, and with the help of frieds I was able to get some of the measurments from several ambulances in museums in the US. They were all built in the 1980s by a couple of farmers from Montana. The claim to have found the blue prints in the Montana State Library, but their replicas are not exactly like the ones in period photos. After photographing my ambulance from the same perspective as in period photos, I have been able to identify about three places where the replicas are off by about an inch, so I am working on a second to correct them.
I collect WWI uniforms, equipment and weapons, and do displays of museums in ouir area.
I have not been able to figure out how to upload photos directly to your site.