If you're putting in the infrastructure of a new network, chances are that most of the pc units will be the same to begin with. All you need to do is create one from scratch and ghost it to the whole lot.
Although granted, not everybody can be bothered, but if you're a tedious sysadmin (as most arent) then you will have the right thing in mind for security by compiling from scratch and removing unwanted components. Plus with the speed of most modern processors compiling gentoo from scratch really doesn't take that long. Hell, winblows takes about 40 mins to 1 hour on a P4...