Why not close it in and put shelving on the benches. You would have several rows of organized storage space with isles in between the rows. the shelves wouldn’t be very deep but it would give you a place to store all those little knick knacks that generally get pilled together in a barn. You know those things you never use because you can’t see everything in the box of junk and you forget you have it. Things like extra plumbing fittings come mind.