The Quality cages chinchilla condo can be stacked 3 high. It does take up about the same amount of space as the ferret nation stack, though. With either, I would recommend building a wheeled platform for them instead of the stand. That way, the top cages are not too tall for you to reach. I have 5 stacks like this and they work great for me. the picture below is of my set up over a year ago. Now we are in a different house and the chins have an entire basement to themselves and their things. If you do what we did, you will need to zip tie the cages together so they do not slide around and you will also need to do the same to the base you make. We have had no issues with the chinchillas chewing up the zip ties.
