Hi Craig - like most of the wood, the joints are covered by sheet metal. There is a good and simple reason for this. The wood skeleton was assembled complete before any sheet metal went on.
I think you are referring to the sub sills. These are tied into not only front and rear posts, but are also attached to main sills by blocking and screws. These are the wood pieces that form the curved contour below the door openings
These 1204 Club Sedan photos may be helpful, maybe not.
John Oder
On edit:
Here a few more. You can see how you can't even see screws until sheet metal down there came off. There is about 30 nails along bottom into sub sill.
JO
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