Morad and I continued to observe the Willman objects. We also started writing crude data reduction tools in IDL. They are checked into "astrometry/pro/morad/mosaic" for now.
In a long and painful session, we solved the hands-off (not blind, because it does use the telescope RA, Dec as a first guess) astrometry problem for the KPNO 4m Mosaic. Here's a QA plot from one chip in one image; squares show the locations of USNO stars; the fact that there are sources at the centers of the stars means that we have the astrometry correct.