The only reason I can see for a R700 with all the options available today is if you are building an M40 or M24 clone. That's what I did and its the only reason I own one. Even kept the OEM trigger. I thought the M700 was the pinnacle of bolt action rifles because of the venerable old M40A1. Then I shot an FN SPR and thought: this is what the M40 should have be built on.
Or unless you have nostalgia for a classic deer rifle like a Remington 700 BDL. I love it's classic looks, but I'll never buy one unless it's a vintage make, a deal that I cannot pass up and just falls into my lap. I will not go shop for or pursue one.
As a basis for a modern, custom build, no.
AG