Reply by Bernie

The opening comment in the video is what jumped out at me… he glued the long grain wood to long grain wood and the end pieces are short (in width) enough so the wood movement is minimized. You have to understand that wood only moves across the grain and doesn’t move the length of the wood so if your building a box 30 inches tall, 30 inches wide and 10 inches deep, the box will only move across the width of one of the 30 inch dimensions and the 10 inch depth (30 inches long) is minimal in its’ movement.

-- Bernie: It never gets hot or cold in New Hampshire, just seasonal!