I'm designing built in benches (two matching at 6'6"). I want to make them as comfortable as possible. I've got general dimensions down but want to build a curved back with lumbar support. The benches will be combined with a table so this is for upright seating as opposed to lean back lounging. I'm planning on using bending plywood built up and then laminating shop cut VG Doug Fir onto the ply. All of this will be new to me (so it's a good thing this is for an addition to my own home).
I've searched for some guidelines on design and am coming up empty. Definitely going to make a 2' mockup but I'm looking for a starting point. Any links, insights, suggestions would be greaty appreciated!