I picked up the hydraulic angle kit yesterday afternoon at Ahearn Kubota in Spencer, MA. They told me it was hard to get because, as usual, demand is exceeding supply. They didn't discount it so I had to pay the full $507 plus tax. I was a little upset when I got home, laid out the parts and discovered that Kubota (or Curtis) didn't pack everything that's listed. It was missing the 60"heat resistant hose sleeve that covers the two hydraulic lines from the rear coupler as it is routed by the transmission/engine. Not a big deal - just aggravating. It's only a $5.00 part. I'm having them mail it to me and will retrofit when it arrives. I plan to install the kit tomorrow - it says about two to three hours in the manual. I don't think it should take that long. There's nothing special that needs to be done - just screwing things together.
I checked the price of the individual parts on line. If you ordered it that way it would cost about $650. If you're self sufficient you might be able to just order the two hydraulic pistons (70000-1198 / $115.50 each) and fabricate the rest.