Roger,
I'm sitting here looking at about 35 Ohio rifles made by various builders and the majority of them have browned/blued barrels and hardware but I have also seen some that were left in the white, very few. The majority of toe plates are plain stright rectangular pieces, of varying lengths. Some of these extend over the butt plate and some die into or are notched into the butt plate. Once again there have been some high art rifles that had fancy, pierced, toe plates. A full stocked Vincent will be more than a little unique, especially in flint.
Mark