The software tools used are SketchUp and Inkscape.
**IMPORTANT**
1. The use of Sketchup is not a must. However, if you have a 3D design and you want to produce it using materials cut with laser cutter / CNC milling machine, it would be easier to first do the 3D design in Sketchup, convert it to 2D, then export the 2D design in SVG format for further process in Inkscape.
2. There are at least 2 file formats supported by Inkscape that could be used by CNC machines. One is PDF (it could be imported and used by CorelDraw), the other is DXF. If you plan to use DXF format, be sure to install the latest Inkscape (v1.0) because the scaling of the objects saved in DXF format is incorrect (too small) in the previous versions. More about this could be found in the link below.
3. Some shops will ask you for design file in DWG format. You could either use PDF to DWG converter (not all of them are free and some of the converted results are not so good or have a watermark on them) or ask whether they could take file in DXF format instead.
Scaling issue saving DXF from Inkscape
https://graphicdesign.stackexchange.com/questions/96509/scaling-issue-saving-dxf-from-inkscape
The Sketchup Part
Step-1: Launch Sketchup. Before starting the design, be sure to set the Camera to "Standard Views - Top" and enable "Parallel Projection".
