Hey Tim, have you considered a scale sized "English Wheel" for smoothing the formed part's? As for reference material, Ultimate Sheet Metal Fabrication by Timothy Remus,
Advanced Sheet Metal fabrication by Timothy Remus.
Link to picture's of various english wheel model's and wheel's,
http://www.google.com/search?q=engli...w=1024&bih=603
Look's great so far. Do you have to anneal the brass when working it?
Cheer's, Neil.