John & Wayne
You might want to give the following link a look. I goes back a mighty long time to an excellent tutorial by an excellent hobby machinist, who we haven't seen now in quite a long time. But back in the day Dean Williams was a regular contributor to the steam community, and his building of a PMR #7 from castings is a classic! As I recall, he built it for another member of the group, many a year ago. Fortunately, his webpage is still up, so we can reference some of his wonderful material.
Here he is now:
http://www.deansphotographica.com/machining/jobs/pmr7/pmr7.html
A great tutorial Dean has made, I miss him very much, he was very kind & helpful to a "newbie" such as I was back then.