Add:
My cage is an alternative C&C cage made of Homedepot's closet shelves, huge cardboard box (instead of coroplast) & fleece as bedding (love those)... totaling 2 X (3' X 3') of an 18 sq ft plus plus (not adding steps & extra second story if I need to).

Special thanks to this great site for all my research & creative ideas of course!