Thanks for your help and suggestions guys. I downloaded SheetCam and had a working G-Code file of what I need in about an hour (including working through the tutorials!) The software is very intuitive and the tutorials well written, although you can tell it's a beta version as some of the screen shots do not exactly match the actual screens (I am a former technical writer/illustrator and can't help noticing these things

)
Now I need to build the machine and finally decide on which one of half a dozen demo controller packages I am going to use to actually run it. Then I can start making chips/dust

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Larry Green