Hi Rune,
The GCode is fine and this is not really a Mach3 issue because the problem appears to be with your use of Sketchup. You have no material size set so there is nothing to make.
My best suggestion is that you check out the Sketchup tutorials in order to find out how to select the area of the drawing you wish to create the GCode for. The Phlatforum will have all the information you need but you will have to search for it.
Hope this helps.
Tweakie.