WHY CHEAP PLY ISN'T CHEAP

We don't like using cheap construction ply, but I admit I was swayed by all those people who reckon it's the duck's nuts, and here's the result!

The red lines that the arrows point to, are not laser lights, they are the sun shining through the voids in the ply, leaving only the decorative top and bottom veneers for structure! The centre veneer is not only missing, but it's meant to spend it's day vertically fixed to a wall, not bent on a boat bottom, and it's a very brittle ply indeed.