Those Turnbull prices are for pre-polished parts sent in for finishing. They don't reflect any charges for labor in polishing, disassembly/re-assembly, needed repairs, bore or rib work, custom metal shaping, ect.
Pricey stuff to hire someone to do. Not everyone can DIY in this area.
It can be terribly expensive to have a well known someone or a group of well known someones build a custom gun for you. The other great expense is the loss usually taken when it's resold. Not always,,but very often the case.
That can be a good thing for the new buyer..
