Sounds awsome! can't wait to see it!

Sounds like an interesting project. Looking forward to seeing it. I get so many good ideas here!!!

I would use the very thin thermore by hobbs or nothing at all. There is also a very thin fleese you can use. The only concern I have is will the loops of the terry get caught in your feed dogs? If you are doing free motion this won't be a problem. To avoid this you may have to put some kind of wash away stablizer on the back. Your idea sounds great. Be sure to post pics of front and back!