I had a cat for maybe 14 years who had been a stray. She was a great one; so I know what ya mean about the cats. Can't say I don't keep weird animals, though, what with the gecko and all...
My idea for what to build is a French tank --its crew pointing out a literal 1/35 frog to some kids (maybe I can do a red shirt or something). Found the perfect kit for this!
Sand I can squeeze into the diorama via sandbags and/or terrain. Setting in the countryside by a pond maybe.
...And, yes, I found 1/35 frogs believe it or not!