I know this is an old thread, but I must have missed it when it was new. I found it was a lot easier to eliminate the old Randtronics controllers than to work with them. I approached it as sort of a complete retrofit and saved very little of the old electronics.
As to the spindle motor. I got the original manual with my KMB1 and it said it was a 4HP machine, but the data plate on the Leland motor clearly says 5HP. I'm pretty sure the motor is original. I don't run those kinds of loads on it since I am running it on single phase. I set my FS software at 3HP for that machine and try to run less.