I finally got started building some plywood boxes for the things in these cardboard boxes. Muchas gracias to Erich.
Edited by petew - 6/16/12 at 12:00pm
Before I nailed the braces in I pulled them tight to the corner with a clamp. That forced the warped plywood flat and made the corners square.
The pocket holes don't have any function in these boxes. The braces were cut out of left over scraps from my oak coffered ceiling project.
More bracing. I installed four more sticks to brace the middle of the panels. I cut the ends at a 3 degree angle so I could tap the sticks into place without bowing the panels out. I didn't nail the ends but the braces are nailed together at the intersection. I've got gobs of glue everywhere.