Look at
www.homecnc.info, a little larger mill with 430 oz-in servos.
Look at camtronics,
http://www.seanet.com/%7Edmauch/ which sells mill retrofits. Maybe he would have a suggestion.
I tried the software. It is not so difficult to use, however supplying reasonable values is the hardest. Try the leadscrew mechanism and supply the values.