The following is a quotation of the work done in September 1961 at Ford. I tried to contact Pam Brown unsuccessfully, but I would have asked her about this work order. I would contend that she was mistaken. In my opinion the work order specifies removing the old center body pillar and replacing it with one that can be quickly taken apart and reassembled. (I may be wrong but I remember a pic of the manufacturing of the limo where that area under consideration had a large metal frame, in the shape of a roll bar, which probably held the heavy class in place).
Notice the document where it says "Provide new glass" and "Provide new glass frames". I am having trouble locating further pages of this document, but I have seen page 2 and if I remember correctly there is no further discussion on the issue.
I will concede that most of the photos on that day show no partition. However, Mrs. Kennedy brought the subject up and Mr. Rankin confirmed it. So I personally will continue to take a look for the partition in photos that I look at in the future.