So our cushions are goners, they're so thin sitting on them compresses them into nil. And, building foam mattresses from scratch has this very weird thing where buying an already upholstered mattress is cheaper than buying foam, and fabric individually - And making your own.
So we found a place that sells replacement cushions for lawn chairs and that sort of thing, and we'll just hack them into what we need.
First, we'll add batting to them.
Each cushion is sown to the next, so we have to unstich all these connections.