I am UK based & they were made by a lovely man who is well known over here called 'John Hopewell' who made the cages for the squirrels in the Harry Potter film.
The stands are on castors & are easy to wheel about by yourself which makes cleaning time so much easier & I can get to everything.
Debbie I know what you mean about the bottom one's as I have to kneel down so I tend to keep those empty when I can & in a ideal world I would have a enormous set up like yours Chinclub & use the middle 2 cages only