If, in your opinion, the extra money buys you nothing, don't spend it! If you look around, you may be able to find a capable 'smith who feels he has something to prove and will work for less; or one who will just be able to tread the fine line defining what you want opposed to what you want to pay.
I'm sure that if Matrini & Hagn were aware you find their work to be over priced, they would be happy to not do it for you.
I will tell you this; when a customer approaches me with a project, describes the job, then adds the caveat "but I don't want to pay an arm and a leg", I know that is a customer who will be unlikely to be satisfied with either the job or the price. In other words, someone else's customer!
In your particular case, you will want to obtain a No.1 action have an octagon barrel fitted by a barrelmaker who offers the service. Then find a custom stockmaker who will make stocks using the wood you provide. You will then send the receiver to Turnbull yourself. Have the barrel blued by anyone who blues. By handling all the procurement, shipping, import/export etc. youself, you will save dollars and time. The various tradesmen you employ will be appreciative because you have simplified their jobs. You may be able to take advantage of this to chisel them down a bit on their prices. It will then be a simple matter to get the bluer to install the barrel on the colored action and the stockmaker to install the stocks. If you re-assert your desire to keep the cost down, they are likely to want to do this for free.
I think it will work out. Regards, Bill.