Just a little update ... I went to the sign shop here in town and was allowed to dig through their scraps bin. I found some plexiglass and some aluminum board stuff. I thought it would be cool for the standing cats but it's a little to hard to cut smoothly so far. I probably need a hand held mini saw to cut it easier. Otherwise it's neat ... nice weight to it.
They are going to save me some sintra scraps and some other kind of foamcore board scraps.