I have a small 4x4 pen/house, and I'm thinking of using it as a coop for 4 of my bantams. However, it was originally meant for two goslings, that no longer use it, and it doesn't have a bottom. I'm thinking of using the deep litter method in this coop, but I have some questions. I need to add a bottom, right? Then I just add wood shavings or hay? The run is separate from the coop, so they'll just need it for roosting and nesting. So I just keep adding wood shavings throughout the year? How often do I clean it completely out? Anything else I should know? Thanks!