Here is a partial view of the frame (made of 2 vertical stiles and 3 horizontal rails). This is where the middle rail joins to the hinge side stile with epoxied threaded rod. On the far side of the frame you can see the first ship lapped board has been affixed to the stile. One huge advantage of making the frame first, and then attaching the finish boards to the frame is that I can fit the light frame to the opening rather than trying to wrestle a heavy door back and forth to fine tune the fit.