Forgive the intrusion but this is not from a long time ALR viewer, builder, collector. Instead, from someone with that great interest that Jim is asking about.
I am not retired, yet, and I cannot attend weekday shows or travel six times a year to visit them. Even when I do retire I will not have the money to so often, as to the time for that, my wife has hobbies too. So, I have to buy books or hunt online for photos. Quality photos are few and far between. But I am far from the only person I know that will spend two hours downloading auction photos when I can find them, for later study.
The best books are out of print and when found command very high prices. There are DVDs, but it is hard to hold two DVDs up together and compare two rifles. If I could, I might not know what I am looking at. If you could buy books, at a reasonable price (sub $30), that had annotated pictures like those posted by Mattox Forge. I would own several. Maybe a set of books organized by school, with at least some minor explanation/example of the differences between the schools showing side by side photos of the details that make a Lancaster a Lancaster, and not a Bedford. I have found the ALR library a great resource, if you know what you are looking for, and looking at.
In my opinion, my opinion only, the study of originals comes with a high barrier to entry. If there were a more "entry level" way to learn the design/style/history of these American art forms, in small bites, it may gain traction. But like anything else it would be slow and require promotion.
Those are my thoughts from the cheap seats...
DAve