Thanks! I will try!
This morning I woke up thinking that something was wrong with the ply pieces at the back. I had forgotten that the rear track was to be elevated so the large sheets needed to be split in two with a large forward piece and the 8" wide rear piece. Luckily, I haven't cut these yes so I redrew them in CorelDraw with a new set of coordinate measurements, so no harm, no foul. I find the period of semi-awakeness in the morning is my most creative time. It always has been.