Back to the 3 pt yarder you mentioned...again very nice...but who has a budget & workload to constitute a peice of machinery like that! With the way the economy is right now, I'd hate to have a note on something like that. I called about a used one out west on a trailer (sit down)....$31,000
I'm all about building you own stuff too. Necessity is the mother of all invention as we all know. Thats why I built/fabricated some of my own equipment. When you're poor, a pile of steel and some time in the shop can produce some nice & functional peices!
Along the lines of this kinda set up (yankee style) ...I'm leaning towards all hydraulic. Little more expensive initially, but so much less maintenance, and user freindly. I've got some figures scribbled down on GPM, flow, sprocket size, line speed etc. (i guess the engineering degree is worth something)
Maybe someone will stumble across this post and shed some light on it for us (and many others).