I have a Taig with exactly the same setup - hardware and software - even configured in metric already. I would be happy to forward the .xml file or post it here if someone could tell me how (only been here this week)
I have the A axis steps/mm setup a bit wierd right now, but it is easy enough to fix for you depending if you want the DRO to read actual degrees or not.
A lot of this depends on your software. If it only uses an emulated A axis you may have to set it up to a very strange number to counteract the adjustments put in by the post-processor. What software are you using to generate code?
I very simply. Use a PM facility or attach facility. About software: dxf to gcode - Deskproto or Mach3. Mach3 to move the machine. Please send me the .xml file at : gabi.balsanu@rdslink.ro or balsanu_gabi@yahoo.com.