Hmmmmm...not to knock them, you were pretty creative, but they really won't last long. Rats are chewers, and they can turn a tiny hole in plastic into a large enough opening to get out of in no time! They need lots of things to climb on, and play on, so you'll need to attach lots of stuff to the sides, top, etc. For instance, hammocks, ladders, toys, water bottles, baskets..... Also, as for the fan, I personally wouldn't use one, since the air blowing on them may not be a good idea. Rats can get respiratory infections super easy. Also, I see you're from Texas. It gets super hot, and humid down here, and I'd be afraid they could overheat in plastic bins. We made cages out of the wire shelves like you'd put in a laundry room. Just cut them to the size we wanted, and zip tied them together. We even used the smaller ones to make small levels. We put one on top, and made it a flip top. Then set it in a long tote that was made for under bed storage. As our group got larger, we added more on. Then you can go to the dollar store, and get baskets, and zip tie them to the sides. You'll just need to put coroplast on the shelves, or cardboard and cover it with fleece. As for bedding, I use a crumpled recycled paper.