I haven't but it sounds do-able. I considered using a rolling shade but it was too light. You're idea will probably work great. Post a pic if you make one!
I had those until my youngest dog ate them piece by piece!! :mad: He'd sneak into my room and do it! lol
I was looking at the gel mats that are sold at Bed Bath and Beyond. I might buy a small one first to see how it works.