Interesting.
fwiw- drip rails aren't a body line.

if one buys a lift off body- no drip rails.

they existed to help with noise and keeping rain out of the door seals- other than that they have no practical purpose and always cause rust issues, thus no new cars have come with such in many years.

On doing restorations, we always have to deal with the rust "under" the seam sealer as well as the metal itself.
We often have to cut out sections, sometimes long sections because to leave it means the new paint will eventually bubble from that rust spreading.