FWIW, I wrote this guide originally, but have since found that inkscape works best to generate SVG, but making the gcode with it is painful at best and disastrous at worse. I purchased a license to estlcam and found the tabs feature and the ease of setting tool path depth and cutting in or out of the shape to be very quick and simple. I would recommend future users not waste time with gcodetools and go to carbide create for free or esltcam for a paid license option to create gcode. Other options include kiri::moto among others.