That critter nation cage is what I have for my chins and I love it, they love it too
I chose that over the ferret nation because the bar spacing is a lot smaller. I took out the shelves and latters it came with and replaced them with pine shelving. I though of making custom pans for the bottoms, but decided instead of spending more money on the whole setup (the cages are pretty pricey on their own not including all the modifications!) I would try fleece for bedding. What I do is take a large piece of fleece fabric and fold it in half a couple times and put it on top of the plastic pans that come with the cage and tuck the ends around the edges. It's a nice comfy bottom and they can't get to the plastic pan to chew on it because it's all covered. It's super easy to clean, just take it out and machine wash and reuse. I just have a couple and change them out for when one is getting washed. It saves you money on buying bags of bedding in the long run. I would recommend trying that. Just make sure your chin doesn't chew on the fleece and rip off pieces.