Sorry s'w' I drive a Honda, not a Chevie and get it serviced by the supplier.

This addition is neat... Martin mentioned this feature...

I can design in SU, but for online/WEB stuff I'm a real noob...

Mailed Martin, however, he has better things to do than teach me basics.  Any more detailed suggestions of how you got from the warehouse to here?
I had this model that I tried to link... (its a biggie),
   https://3dwarehouse.sketchup.com/model/ef232dd9-9cfa-4da9-a1ee-0bb0ed5827be/Train

If your first cut is too short... Take the second cut from the longer end... LBD