Sorry you had such a mess to clean up. Maybe she chose the bathtub because it resembles a giant box? Her watery poop could be due to something she's eaten outside. I wouldn't worry too much unless it continues.
I'm familiar with the Denver skyline, my parents lived there for over 40 years. Your dad did a good job, Denver is one of those cities identifiable from it's skyline. There's no confusing it with any other place.
All the credit goes to DH, he's good at this sort of thing. I help him find his tools, hand him screws and clean up after him. :gig
Hopefully I'll be able to get a picture with a cat or 3 in it before long!
Rob, thought I'd share our catio (in progress):
Our 3 house cats will be able to go out and in via their cat tower in front of one of those house windows. DH is getting close to putting up the hardware cloth today. Opie, Pip and Bam Bam are going to love this!