As I’ve stated before, this ruleset is a hack of Trent B’s own OSR rules.
This PDF has the info of the races and the class, but it also has everything else you need to play.
Also here is the Short Concise Spell List for Warrior Priest, Druid, and Sorcerer (and Witch).
Edit: Finished the Ritual Casting rules.
One goal I do have with Hubis, as I develop it, is to emphasis that while I, and my group, are playing OSR-style rules and “feel,” that it is in no way demanded to play in that fashion. If people want to make it more “heroic” and play 4e; more power to them. If they want it “pulpy,” then they can convert stuff and play Savage Worlds.. Whatever peeps want to do is Jake by me.