I'm going to do the same thing, except to install front hydro outlets for angling a snow blade. I bought a single spool valve, a lift cylinder, front hydro steel lines off ebay and a "splitter" kit from xtreme motorworks. I'll install the second valve using the splitter kit to run fluid to it from the original valve, and actuate it separately from the existing lift control. Haven't decided exactly how I'm going to do it yet, but I've seen a few others' designs. the hydraulics are totally doable. Now you are talking about splitting your lift mechanism front and rear, You'd need to fabricate a separate lift arrangement for the johnny bucket. I'm not sure how you'd do that but it doesn't sound too difficult.
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