I have a 1915 Tourer that I am restoring.
One of the body sills / rails (the wood that runs the length of the body on which all else is built) was rotten but the previous owner had bodged a repair. I have removed the bodge and want to rebuild as it was originally. The attached sketch shows the the main components as I understand them but I don't know if there is more wood hidden from view. Are there local pieces of wood or even a continuous piece?
Does this help?
Yes, there are spacer blocks between the two horizontal pieces, usually go against the upright posts too. As the area is hidden, you can add extra blocks if you want even more strength--but be careful, the whole thing still has to flex as the frame & body moves around.
This shows the spacer in my '14. '15 should be much the same.
Lovely photograph. It explains everything I need to know.