Rich, you do bring up an excellent point in regard to the bridle. The Chambers English/Virginia style is the most externally correct looking for most of the NW muskets I've seen, but they are bridled. The Late Ketland is available without a bridle, and is correct from original artifacts.
At some point in time I plan on building another NW gun, and when that time comes I'll most likely try to make one as close as possible to the imagery I have on originals, which means I'll have to modify a Chambers English to remove the bridle. Not hard but certainly another step