Early in the process, we have decided to add another layer to the story.
They are:Additional animals - this can make the reading activity more fun. One this page, parents can allow their child to explore other animals that live undergroundVintage  - The Volkwagon Beetle, Vespa scooter, Polaroid camera, and vintage postcards! All these give the book an evergreen theme
I tried to stay true to real Beetles and Vespas as much as possible, and for this I used SketchUp.
Fire up SketchUp, and down...