We made ours with a mesh material that I sourced from http://www.rockler.com/hand-woven-brass-grille and took the regular door panel and removed the centre of the door and used a heavy glue to secure the panel in place... I may later have the cabinet guy put a light cover over the edges of the panel if it seems to come out or loosen. So far it easily contains either our cat or dogs... although I need to find some kind of latch to keep it locked... as they each can open the door (even the cat) to let themselves out.
Q