The most complicated issue with it was the little tunnel that you see on the left. We attached the tunnel to the patio screening with a special pet door made to fit thru screening. Cats were scared to death of it for the first few days. They never have learned to bump it open. LOL I just propped it permanently open with a bit of wire. Silly things. You’re welcome! Let us know how you get on with it! Good luck! Yes they will love it!
I was thinking about building it out of the den window with a screen door outside that I could come & go from. I’m going to work on plans now.