The overlap
 
The overlap

You can see that the thumbnail bead of the middle stile will overlap the rail on each side so that a space will never occur. There will be two pins in the rail securing the joynt. All paneled joynts in every building in all of the colonies in the 18th century come together like this !!!! After all these years I'm still in awe of the industry of this construction, the craftsmanship, and millions and millions of board feet worked all by hand and body ! Oh, then there's the rest of everything, I repeat - all by hand, inside and out ! Are you saying WOW yet ?? >