Hi there I just purchased this cage with add on units from Critter Nation also known as Ferret nation. You can creat fleece covers that Squirrels wont chew!!! Sew a baby blanket (like a pillowcase) to cover the plastic pan..It works!
For the bottom pan you can buy a Ferret Nation Scatter guard which is metal and slide over the corners of the bottom pan..
This Cage is amazing! Critter/Ferret Nation products are the same brand/cage.. Here is a link.
Ferret Nation Lower Scatter Guard...
https://www.amazon.com/dp/B004UL3EUI...p_mob_ap_share
This is the cage I got her as I liked the dimensions and how tall is was from base to top too however there is so many plastic pieces on it and she’s chewing at them all especially her shelves we’ve had a week and she’s around multiple shelves already. I seen someone so they like the fair at Nathan cages but they don’t look that tall and considering she’s only out about five hours per day out of her cage I don’t want her in something tiny either.