I am interested in contacting Bob Roller if he is still active. I understand he manufactures percussion cap locks, and perhaps flintlocks plus breeches for his locks - that he machines from bar stock.
1. He's 75 and only active when it pleases him. He picks and chooses what he will do.
2. He doesn't make locks to order. He uses a limited number of existing plates and fits his own internals to them namely Hawken, Alex Henry, Gibbs and a couple others. He "might" make a flint lock from one of his own patterns.
3. He doesn't make breeches. He has my Rigby breech castings now and hasn't decided if he wants to do them yet.
My advice to you for your projects is to choose a competent gunmaker and let him serve as general contractor, choosing subcontractors who will make special parts. He is the one who has to fit everything together in the end and doesn't want a boxfull of parts provided by you which may or may not fit. If you want a gun built, turn it over to someone who knows what the $#*! they're doing and be prepared to pay the price. Guns are built from a consensus of advice garnered from forums, and such a person will turn many builders off.