I do actually have a couple more things you might be interested in. A few years ago I made some additional parts to match Catfish's aviary cage set that includes 1- and 2-unit-high cage walls and a 2-unit-high 3x3 cage roof, as well as a wall matching the height of Catfish's set with a 2-unit-high hole at the bottom, so an enclosure using both heights can be connected. The hole wall and the 1-unit-high wall can combine to form a 5-unit-high wall with a raised "window".
There's also a 2-unit-high 3x3 glass ceiling that works the same way as the aviary ceilings where it only takes up the middle tile. I've found the corners on the glass ceiling can be a little buggy overlapping with neighboring graphics because of that, especially fences and walls directly around them, but it's bearable.
Here they are in a zip. [update: these files need realignment before use]
If you try them out, let me know if you run into any placement/alignment issues with them, I'm pretty sure I found the most recent versions of the files I've got but I could be wrong.