Catacomb of benches cut out of the tufa rock.
And in the middle was a rough table with benches around it instead of chairs.
Another option is to use benches and stools.
While they may not work in a really formal room, small benches can be a great seating option.
Work benches with storage bolt to the wall of your garage for safety, are counter height for ease of use and come with built in cabinets, drawers and locks.