Making second floor?

Basically, you use your connectors to snap on more grids. Build up, and also snap in a floor with the grids, cover it with coroplast or your choice of base. Make sure the grids are sturdy; you can give it more support by adding twist ties along with the connectors. If you need to take it off, you can simply unsnap it all.

If you click here and look at other's multi-level cages, you may get a better idea. :]

I'm thinking of making a second floor, but Walmart doesnt sell connectors anymore.