LBD- thanks.  Odd term perhaps, maybe better "room by backdoor to store stuff to try to keep the rest of the house cleaner" - that seems too long.  🤔 

Have looked at SketchUp but couldn't get it and wasn't willing to invest the time to learn.  I'm at the computer a lot for my "real job" so for my hobby, that's not so appealing even though it looks to be a great tool for designing and troubleshooting.