Ahoy Stynky, Cascabel here.
As to prices, for the pieces I build, they are in the $2000 range. Top quality parts are pricey, and so is my time. If I build a piece for someone, I require 50% up front, and the rest upon delivery. I know it's a bit steep, but I'm not in the gunmaking business, so I have to make it worth my while to set other things aside to build for someone. The advantages are that you have something authentic that can't be had from the local sporting goods store and is EXTREMELY reliable. I also do gunsmithing on flintlocks as needed. However, I am constantly asked to make a cheap piece functional, and usually scare people away when I tell them what is involved. ALMOST any gun can be made to work well, but it is a judgement call as to whether the amount of labor is worth it. I have done it quite a bit for folks that just had to have a paticular piece in working condition, most notably the cheap "TOWER" pistols from the 60's and 70's. These vary in quality from just about O.K., to absolute junk, depending of what factory they came from. Externally, they all look pretty much alike and ALL have bad geometry and unbalanced springs. They can also benefit greatly from a bit of re-styling. I have one myself that you have to look at twice to realize what it is.