DO NOT use SketchUp it’s not CAD whatever they say. Awful, awful application.
Its great at what it is, but it is what it is. If you’re non-cad trained then its pretty intuitive to use, if you are CAD savvy (or even just vector graphics savvy) its seems totally un-intuitive because your intuition is based on those conventions.
sketch up is easy to use but can take a fair bit of fannying to get from model you draw to the file a CNC machine will play with
I draft up my sculptures in sketch up (just because its what I’ve always used) but I need to keep an old version of sketchup 7 running – export my models to that in order to use a plugin that only works with that version to export individual faces as SVG files which then need tidying in inkscape to be ready to pass on to sheet cam then then into my plasma cutter
Keeps me busy
So does repeatedly trying to select a tiny dot to delete it before realising its a bit of dirt on the screen.