I cut dados in the top and bottom pieces and along the front and back of all four sides (to receive bracing). Dados make assembly so easy - no nails or screws, just Titebond II wood glue. Bessey K body clamps are a wonderful piece of engineering.
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.
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