Have you guys seen these ? Bit fancier than what we did. Hubby simply drilled holes into the base of the bucket and screwed the buckets directly to the wall. I buy my laundry powder in buckets and they are very sturdy, easy to clean.
http://www.efowl.com/Nest_Box_Bucket_Kit_p/801-1079.htm
What a great idea? Not cheap though. It does get the grey matter working too.
Does hubby keep the lid on and cut a hole for access to stop them scratching the bedding out?