Interesting, thanks for posting (and thanks for helping him, TB).
I've heard of using a box blade, never tried it.
We have an identical Freeman on our Ford 3000 and I'd thought about a setup like this (until we got our 3400 w/loader last yr). Nice work putting it together. Have you used it yet? It looks like you have the Freeman SA lift cyls - do you have a float position (how did you do it?) and, if not, how well does it work without one? Someone on the Ford forum (Ultradog?) has said that lack of float made it a PIA for him. Last question, how well do the front blade runners work when the blade is angled? Do they swivel around and point forward like they're supposed to?
When I was thinking about our Freeman, I was always concerned about the relatively light frame, that I might prang it even with trip springs on the blade.