Oh my goodness I am so jealous!! I really want a little group of mice. I saw some gorgeous golden baby mice for sale at the weekend and I was sooooo tempted!! Please post some pictures when you get them!
With the first cage I think that I would take the top level out or lower it and put lots of hanging things from the roof, as it is quite a high cage, so that if hammy does take a tumble he have things to grab hold of. Maybe also put some more ramps in, to make more routes up and down.
With the second one the tubes look quite a way off the levels - not sure if little mices would be able to reach these or not?
The cages look great though, really roomy, not sure what make they are though.