Here is the cat 0 hydraulic Cub tiller. It is a model 190-004-100. I hear that they work awesome, will fit your cat 0 hitch and you can run the tines forward or reverse by the lever on the unit mounted spool valve(or whatever that handle do-hickey is). These are for the 3000 series tractors and use a shaft to turn the mid mount pump but you could mount the pump up under the front pto and use a short belt. I just missed one up in eastern Pa for $500. They hold 4 or 5 gallons of oil and it looks like they use the tiller shell as a heatsink.
004 tiller.jpg