I have it running up to the calibration screen now in DosBox. I think the PP201.CHD image is corrupt. Even with the geometry of the disk in the CHD i cannot mount it under dosbox, no matter what i tried.
I will submit the image to the Dumping Union if i'm properly happy with creating it properly.
Right now i'm mounting a 2.1GB drive and extracting the backup to it from a fake cdrom iso so that's not the way to go. I want it to match a real disk as closely as possible.