I have the hexagonal cage with the troublesome tiny doors and I really liked the idea of the inverted cake keeper glider kitchen but wanted to rework it. I was shopping for glider stuff at target when I saw this for $3.99:
And I thought it would make a great glider kitchen. So I took a cue from the original glider kitchen idea and used a doorknob hole saw to make glider sized openings.
I put a scrap piece of plywood underneath the plastic so it wouldn't bend and crack. I cut two holes in the box, one on the side and one on the back.
Then I used a utility knife and a sanding sponge to smooth out the cuts so gliders don't catch their fur. The end result is a nice, washable, easily removable glider kitchen.
Looks great. I tried to make a kitchen with a plastic shoebox size container and the same doorknob atachment thing you show in the picture and it was a disaster. Didn't have plywood under it so the thing was spinning all over the place. Once I did get a hole...it was scratched up all over the plastic in that area. Then I wasn't sure how to smooth out the hole. I just returned the attachment and I am going to buy a kitchen from someone. Lol. I am surprised I actually didn't cut a 2 inch wide circular hole in my hand or foot!