Above we see the two side stiles of the door, showing the mortise channels than have been punched.

Here you can see the male end on the bottom kickrail of the door, which will fit into the mortised side stile above.

Its the same on the top of the door, only the arch always adds some extra time in the layout (as well as a few scratches on the head)

...another angle to view.

Here is the door just prior to assembly. The centre panel floats in a channel inside the rails and stiles.