The picture above shows the mock-up of the extension wing and table top end piece.
You can see the table top end piece better from this view with the sliders below.
The extension sliders are supported by the table top.
Here I added a piece to dress up the edge and protect my legs from the sliders.
This is a mock-up of the entire table. It's going to be big! (I have the sandbags holding down the table top for mock-up.)
And the side view.