After having her 3 months, I decided to upgrade Gaia's enclosure from a 4x2 to a 6x2, adding in the the features she likes best (warm side pig-pen hide, large slate eating areas, etc). I found that panels scavenged from those foldable dog exercise pens make very sturdy screens for the top. I'm sure any of our 4 cats won't be able to break through . Gaia seems content for now.