Doxhound, unfortunately, there are no plans or drawings, just many hours of doodling and dreaming. I will answer any questions I can.
There is only one valve and the three point. I used the bucket tilt valve, push right to extend, pull left to retract.
It is not tippy at all. The boom pivots on the hitch and is supported by the gauge wheels on the mower. I can't hold the boom off the ground, it will only extend and retract.
It works perfect on our 1/2 mile of steep roadside. /forums/images/graemlins/smile.gif