Emphasis on skeleton as it's clear that while a number of mechanics are hinted at none are actually presented--which, of course, is the perfect opportunity for all us kit-bashers and homebrewers.
(That's a nudge to the rest of you, I am plenty busy with the Domain Game.)
Fortunately for lazy old me it looks like the gnomes over at the Acaeum saved me the bother of typing and formatting. You can download the standard boilerplate presentation here.
Interestingly, a second d20 version was put out in recent years by JG that can be found here.