Hello Metman
To answer your request for identifications on the engines you have posted photos of, here are answers for some of them:
1. PM Research #7 Twin steam mill engine
2. PM Research #1 1880's steam drilling engine
3. PM Research #4 Vertical steam engine
4. Unknown, possible home built single cylinder horizontal steam engine
5. Mamod TE1a steam traction engine, appears to be missing the "coal" scuttle back end & steering rod.
6. Unknown single cylinder horizontal steam engine with an unusual looking slide valve arrangement
7. A Stirling Cycle Beam Engine of uncertain manufacture, but there are many Chinese knock-offs of these currently available
8. Unknown Steam Beam Engine, possibly home built
9. Incomplete Weeden #123 with two Weeden Line-shafts and several Weeden accessories, along with accessories from Doll, Fleischmann and Wilesco
10. Self Identified, Mamod Minor 2
Hope this helps some, and perhaps others can help fill in the blanks.