You're making good progress. Last year I picked up a Lagun mill with the same controller. My intentions were the same as yours. (to update with a PC & Mach software) I decided to plug in the mill and was suprised to find that it worked as is, although with the limitations of an old controller. Since I'm still in the learning stages, the machine will do all that I need. When I start to run into those limits I'll try and follow your steps and upgrade.