For just learning to have to use SketchUp, your off to a great start with this one @Kyo ! Have fun Mark
I'm in the same boat - I've been designing my electronics 3D printer (link) and haven't had time to build my 2' x 4' CNC. But now I need to mill plates for the printer so I'm getting back to that build. Best of luck and let me know if/ how I can help with your design.