The one end, I screwed an additional piece of plywood to the top to hold these together.
The end of this piece lines up with the line on the top strip. Picture angle isn't correct, so it looks like it doesn't line up, but it does.
Next, on the left side, there is another piece of plywood screwed to the top of the first piece, and also to the strip of wood that I am using as a fence. (red arrow).
The other end with the red square, is the screw that holds the other end of the strips together.
The left side with the blue square, is where the screw is on the bottomn piece of plywood, that is screwed into the strips.
You will notice that the side of the long piece of wood, lines up with the diagonal line scribed on the strips.
The long piece of wood goes against the table saw fence and therefore the saw cuts right along the scribed line.
