I saw this post yesterday. Been-there, done-that a long time ago. I personally have been using SoftPC on my Lisa's since 1994. I even have had made lot of tweeks to make this work better.
1. I use a version of SoftPC called "Entry Level SoftPC", this version is optimized for 68000 ( not 68020 +) based systems.
2. I made a special font called DOS13 that is a 13 point font to run full screen on a screen mod Lisa at full resolution.
3. I had James add a special option to the MacWorks+II Keypad control to add extra keys needed that the stock Lisa does not have. This remaps the clear key on the num pad to be a needed key using SoftPC.
4. Under MW+II with the 18Mhz XLerator this runs quite well, runs as fast as a real PC-AT if I remember correctly.
I can provide more info if folks are interested.
Rick