The table shown here is
made of solid birch.
There is no plywood or particle board found here.
Two removable (grain-matched) leaves were made for this table, allowing it to be either 7, 8 or 9 feet long.
An Interesting Requirement!
The client required it be sturdy enough to hold two dancing 200lb people on it. Now that's custom! When the customer arrived to pick this piece up, I had put the two leaves in and was sitting in the center of the 9' table.
(That's 180lbs on the weakest point of the table!).