I would get a wooden one so they can't chew on it. And wood isn't see-through so he wont get spooked by shadows. This one is fairly cheap if you have amazon https://www.amazon.com/Kaytee-100079175-Chinchilla-Hut-Hideout/dp/B0002AS5MI if you don't want to support amazon a lot of pet stores cary it. You could tell your mom your chinchilla can eat the plastic and get intestinal blockage.

You can also remove the ramp and put a wood ledge on the side. They can be fairly reasonably priced too. Just make sure its kiln dried pine or a safe wood for chinchillas.

Good luck!