Remington model 6

[fix]

The brass would have to go over the steel (like a lamination) or you'd have to bush the holes. All of the parts are held by the side plates. The frame mostly just acts as a spacer, and it provides a place for springs.
I did consider brass though. It would look cool. Maybe if I build a second one.
Or, if you were to build one in brass I would gladly watch that thread.