Re: To buy or build, that is the question
If you had all the parts in a pile and asked a good 'smith to build it you could most likely save enough to have a solid start towards the scope. Keep in mind that teh complete rifle is a turn-hey solution that you can have next week. Not something you're waiting for completion.
Getting a gunsmith to chamber the barrel and mate it to the action isn't all that expensive, a bedding job isn't very expensive, and the coating of your choice isn't either.
If you're starting with a $2600 pile of parts I would estimate (since I just did some pricing myself last week) you could spend another $800 bucks and have the thing put together for you. You'd be on the hook to mount the scope, but it's really not a difficult job. There's a bunch of instruction threads on here about it as well.
I was pricing things last week to see if it's worth my time to true a 700 action and chamber it up or if I should get one of our friendly gunsmith's on this forum to do it for me.
Turns out that the assembly prices are very reasonable. I think people ought to understand how their firearm works and how to care for it without having to run to a gunsmith for little things like mounting a piece of glass. I'd suggest that the best you could do would be to assemble the pile of parts, have one of the 'smiths on here barrel the action and bed the stock and coat (cerakote, bluing, duracoat, whatever) the barreled action and bottom metal. You mount the scope, hang the trigger, etc.
It would probably make your custom rifle run another 600 bucks on top of the prices, you learn about some intro things and have some sweat and pride in knowing that you were involved in the actual final package, and you save some money.