I run build systems as images on an ESXi host which runs on a Mac Mini.

The easiest way to install OS X on ESXi is from an iso. My scripts for creating these isos are not as nice as this one. (I use ESXi because I find I can get one or two more build VMs per Mini this way.)

I'd never heard of Disk Maker X before, but at a glance it does not look like it can emit an iso.