Hi Andy, and welcome to the board.
You don't say if it's to be an indoor or outdoor aviary, but I'm guessing indoor.
Try to get hold of some branches to put in to the aviary from the start. Yes they love tubes, but they also like to perch at various different levels, and the branches will help keep their claws short and give the munks something to chew on. Just make sure the branches are safe wood, like from fruit trees.
I don't think that cardboard tubes in the soil will work for long, as they munks like their soil kept damp, consider using short lengths of plastic downpipe, should last forever then. The soil needs to be changed every so often (it will get stale and full of seeds and nuts if its indoors), so I put it in giant garden pots. With the soil in a pot it's much easier to keep it wet, without damaging the floor. Chipmunks like to digg deep, at least a foot or so down, so a deep wide pot is good
I've never tried mine with earthworms, but they would probably like them and they're safe.