For $25,000 it'd have to be alot better than a 'colonial grade' to match other makers.
You're almost up to the price range of Searcy's Rigby/Bissel Rising Bite Sidelock of $32,000
Then when you add on the importation and a markup for the local distributor... It just doesn't add up.
Mr Baily Bradshaw in Texas is building a falling block double rifle up to a 500 NE for less than your bacic price.
Then when you bring the contiental makers in to the fray, it's getting ugly quickly.
I have 13 DR's now and they include Ferlach 'Best Quality'
A. Henrys, Searcy and others.
This is now a world wide market place at the click of a button.
Peter Taksdale formerly of Purdys (IIRC)is building a large bore DR C (Colonial)class for $8500.
Perhaps you can source actions from Merkel as 'Rigby' of California does?