Just a update, I posted this last fall when it was just a idea, and got a lot of good inputs from folks, which motivated me to pursue it. I've backyardED a solution here w/ a 4' mower mated to a '41 JD H.(via a 2 pt mount) There are still a few minor bugs (mostly with the tractor) to work out (including I discovered that the tractor PTO shaft was bent, replacement one otw). As you can see the cross draw-bar wouldn't mount exactly center onto the tractor draw bar, so I took advantage of this and mounted it left-of-center which allowed the mower shaft to be in center alignment with the tractor PTO. I've mowed with it briefly and it works pretty good, the H pulls & drives it well. Any observations/comments welcome. I'm looking forward to using my riding lawn mower this summer. Thanks to those who provided earlier inputs