I am going to build my two guinea pigs a cage. However, the whole coroplast thing seems so complicated and I have a feeling I'll have to travel to a store 45 minutes away just to buy this stuff. So I thought, as an alternative, I could use a shallow but large transparent plastic storage bin and put the wire cage inside of the bin?
Such as this one: (but of course with no lid and a much bigger one)
I was wondering if it's safe or if it would grow fungus or something funky like that.