I think Flintriflesmith is right on the money as to useing many of the vendors as source data, I would definatel stay away from iron for an early Virgina just to hard to support in early guns, and one needs to define early some start it at 1780 some at 1770 some at the start of trhe Rev war, I think a lot of builders go with a gun with strong English influence even though there were German smiths there at the time, going with the Engilsh influence allows some recognizable traits to be incorprated for easier identification, diminuitive cheekpiece, modest amount of carving, English style furniture
pointed finials on butplate and entry thimble, colonia/Englishl roundfaced lock, often a Beavertail relief carving behind the tang, occasionaly a triggerguard with no griprail, .54 and up bore size, most all the guns in RCA that are attributed to southern gunshave a bit of curve to the upper and lower buttstock rather than straight like the Lancasters.I probably missed some but this is how I see the early Virginia rifles as they are presented today in kit form or finished guns, nothing here etched in stone, just my observations, others may provide something different, I only lay clain to being a novice gun history student.