Learned a bunch

The 2D DXF export is apparently not really 2D.  The files when imported
into VCarve had many vectors that could not be joined.  Better process.
Take the DXF into Rhino.  Make2D command on the vectors.  Then export to
DXF again for import into VCarve.  Worked much better but not perfect.
Still had to modify some of the vectors in VCarve.

Also, there's a setting in SketchUp for Units.  Its under Window/Model
Info/Units.  The precision was set to 1/16".  Need it to be 1/32".  Will
need to see if the model needs to be redone from 1/2 to 15/32