The goal was to be able to perform a network install of OmniOS from a Debian system.
I know there is refinement that can take place in this process (and these notes), but this got me up and running.
All testing took place on a Mac running VirtualBox with the extra extensions installed to allow for PXE booting. However I cannot see why this wouldn't work on real hardware in a network that is already setup to do PXE installs.
I setup: