Back to the barn-ish door today. Instead of using just cleats and braces, I'm building a stile and rail frame, to which the 5 boards will be attached. The 3 horizontal rails join to the vertical stiles with 1/4" threaded rod, epoxied into both members. It's fairly easy to do and makes for a rock-solid frame that will easily resist racking. Here's the bottom rail with threaded rod epoxied in place.