I need to make a 1.5' to 2.5' tall cushion (x 29" square).
It's for a tall person who needs to be able to put this on our couch so he can sit properly. I have two 4 inch x 29" square spring coils (the coils are approx 2.5" in diameter) that I got from an old couch.
I also salvaged 1", fairly soft memory foam from that couch.
My question is, can I stack the spring coils to get some of height I need?
If so, what should I put between them to prevent them from destroying each other? I'm assuming I need to put several different types of foam layers on top.
Do I need to do anything special in the front/top where his knees would be?