Having only a rudimentary knowledge on Southern Rifles, I've been doing a lot of research on them in the last few months. One thing I've found is that it's not possible to define a standard style for a Southern Rifle. Just taking a look at the Kentucky Rifles Foundation's CD on Southern Rifles you start to understand what a huge range of styles are under the umbrella of Southern Rifles. And that CD is just scratching the surface. I don't know if it's really possible to build a "generic" Southern Rifle without straying in the realm of a fantasy rifle.
As for what type of hardware they had, there's really no standard there either. I really like the Gillespie family's rifles and decided to build one based on the Philip Gillespie rifle pictured on pages 36 and 37 of "The Gillespie Gunmakers of East Fork, NC", by Dennis Glazener. This rifle has brass butt plate, patch box, trigger guard, thimbles and entry pipe, a poured pewter nose cap, and a copper washer on the single lock screw as the only side plate.
I'd rather pick a particular maker and build a Southern Rifle in that style as best as I can rather than take a pinch from this one and that one and roll them all together into a single rifle. The same goes for any style of rifle really, not just Southern Rifles. Others may agree or disagree as they choose, but that's my tuppence on the subject.
Mole Eyes