I ran into this relatively recently posted drawing collection. Some of you may find the content interesting, however, the way it is done is also relevant to RR preservation for those of you who have drawing collections you wish to share, but control commercial usage. You can look at the drawings and zoom in in places to see detail and capture a section. There is a link with a variety of downloadable formats in lower resolutions and citation already setup if one wishes to provide a reference. But in the case of the large format engine drawings I was looking at, that won't get you a readable drawing. Anyway, I think it is really well done.

https://texashistory.unt.edu/explore/collections/BTXBP/