I have done excavators, bobcats, bull dozers, graders etc and usually go on site and take pictures, measure everything and find out exactly what model the unit is.
I had a grader and bulldozer (2 different owners) that both had later model graphics and as they were getting painted the owners wanted the original back on. A bit of research on the net found them. They usually are very basic and straight forward, because they are work horses the manufacturers keep the graphics to a minimum and basic.
By camera easels you mean tripod...Yes?
Sure that's an idea but it'll take years to list models and the final work will be approximate.
tks
A photo with a horizontal and vertical scale is necessarily more accurate that a line drawing. The latter is merely a map while the former is the territory.
I've been snapping pictures of things using a framing square taped to the subject for years. Any images and lettering I've made and applied based on these photos have never been off more than a small fraction of an inch, if at all. Certainly never enough to matter to anyone but the terminally pedantic. Can the same be said for a line drawing that's at least once removed from the subject?