They are really enjoying the space. If I went from a 12x15 space, half being taken up by a feeder and waterer to a 4x3 space, I think I'd be happy too! They are trying to roost on the shelf, may have to block that off. Don't want them getting hurt!
I couldn't find any cardboard or wood worth using, so I stole a bird cage idea and used a fitted sheet and snugged it under and around. It works PERFECTLY!