This past weekend I put my own eyes on John Henry's disk conversion project. He figured out the bearings, rotor and caliper to make it work, but has been stopped by a problem with the steering stops.
John is a careful thoughtful guy so I expect he'll figure it out, but the most recent news is his project is hung up while he works on it.
I haven't seen him post here in a while, but maybe if I tell him I posted about him, he'll jump in and give more details than I remember.
Regarding my own project I'm leaning very strongly toward going the IFS coversion route. This coming weekend I am going to do some more measuing and may mock it up.