Reupholster SMB Gaucho Bench?

[Redrocks]

Our older ('98) gaucho bench is uncomfortable to sleep on (low spots, saggy, etc). I haven't found any discussion on reupholstering it, etc. Has anyone worked on turning these into a better bed? Considering installing plywood covered with good foam and recovering it. Any suggestions? Thanks!
(Ford econoline E-250 SMB)

[REF]

It probably just needs a refresh from what’s there, assuming there’s springs? Get some new backing fabric, foam and new fabric and it’ll feel like new.
Find a auto upholstery shop or a van upfitter that isn’t swamped(good luck). I had this done a few years ago, got rid of the tufted buttons and went with a more modern large square grid pattern, came out great.