I haven't kept up with PC specs in a few years now.. but 48GB of RAM - do you plan on running C.A.D. software on the side as well? and aren't Xeon processor more for servers than desktops? How much is this monstrosity costing you?
Well, a 1TB SSD alone would cost him around $3-4000, and the rest? Well, that's running at the theoretical limit of that motherboard, and that's an incredibly powerful motherboard. The Xeon may be a server processor - but that just means it's rigged for better multiprocessor support, it'll still work (work incredibly well, even) in a desktop configuration. That's the sort of machine you build if you've won the lottery and have money to burn on a machine to last 20 years. It'd be overkill for everything - but by the same virtue it'd never struggle with anything. Too much power is better than not enough.