Like Gerry says any design program should be able to produce the artwork & the drag knives are designed along the same lines as a vinyl cutter (plotter). From what I can see the biggest problem is intricate or small work as the blade swivels in the holder at turns which would make it tear the material at sharp corners. Some high end plotters get round this by using a tangential mode of cutting where the blade lifts from the material turns & is reinserted into the material at each turn. Not sure if that would be possible with a cnc machine, suppose it could be if it could be written into the g code.