I think the original table had a leaf in it and a flatware drawer under it.
Easy to figure table dimensions. The table fits into the two notched in
the edge of the seats. So you could use a piece of 3/4" plywood cut wide
enough to fit into the notches. Length would be about the same as the
of the seat. The corners toward the front should cut off a few inches at
an angle or rounded to be able to more easily get around the table to
be able to sit down....
Here is a quick sketch of the one I made showing dimensions..
29 3/4" Wide
42 " Long
Here is a source for the hardware to hang the table. I made a folding
leg out of some scrap aluminum tubing....