:cool:
I use three quite hard pillows at the moment. I think they are 'shape foam' based. A cushion is better. You can make your own, maybe even customise . . . which I have not yet done.
http://www.buddhamind.info/leftside/lifestyl/medi/zafu.htm
The chronic back and hip might decide a chair or bought comfort is best. I have used phone directories, catalogues, folded towels.
Tush up is the important bit.
What an exciting project. Sitting on pillows making something to sit on. Nice cycle to it . . .:encouragement: