Probably the easiest thing to do here would be to export an STL from SketchUp and then do the CAM using MeshCAM (but that’s an additional purchase for a Shapeoko).
In order to get tabs from Carbide Create you would need to draw them in, then do Boolean operations (along w/ suitable duplications) to get areas which you could cut as pockets leaving the tabs in place. Sort of like this:
Recent discussion of this sort of thing:
If you still have trouble with this, feel free to post the .c2d file and I’d be glad to work up step-by-step instructions.