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I would expect it to scale pretty well, at least until you reach the limits of your disk and buffer RAM.

The build process supports the -j option just like make. You can use -j N+1 if you want to keep all your cores busy, or -j N-1 to keep your machine more responsive during the build, or nice and -j 1 if you're in no hurry and your machine has more important tasks. (Actually, I think reasonable defaults for these might already be part of the build scripts, but it has been a while since I looked.)

It scales amazingly well with the number of cores you throw at it. Definitely the 3950x would work great.

that should tear through it. the linux kernel for instance compiles much better with higher number of cores