Step 1: Gathering the materials
4x4 posts approx 6ft long (4)
4x2 rails approx 3ft (2)
Palings (enough to cover a 6ft x 3ft surface)
Tip: because of the age of the wood I found it easier to saw the palings off the frame before de-nailing, to prevent splitting them.
Step 2: Constructing the frame
Legs: 30 inches
Rails: 72 inches (6ft)
Cross members: 34 inches
The top was laid out on the floor of the garage and screwed together using 4" long screws (also salvaged from the gates). Next the legs were attached with 4" screws and then right angle nail plates were added for re-enforcing.
Finally the hinges were added, mostly for decorative reasons, but also to stiffen the corners.
Step 3: Finishing the table top
The palings were first nailed to the frame. I started pre-drilling the palings but after I grew confident that they were not going to split I omitted that step.
The table top was then cut to width leaving about a 1" overhang all around the frame. I made the cuts with a hand saw as I suspect a circular saw would be too harsh.