We adopted a rabbit a few days ago and I am wanting to make him a cube cage. We have 90+ of the wire cubes, but I dont think I will be using all of them

If anyone would like to share pictures of their cages or a site that has plans that would be great. Or just general guidelines such as the max. height/levels, how to make doors, how to hold the levels up (I was thinking of running a piece of chain or rope through PVC and attaching it to the levels with clasps of some sort), what to use to cover the floor of the levels, etc...
Thanks a lot!
Jennifer