Would someone look in my photos file and have any ideas about my questions there?
I believe that the fitting in this photo is likely an attachment point for the hammock bunks that were optional on most Airstreams at least through the mid-1970s. I have four of these over the side-twins in my '64 Overlander for the hammock bunks that were ordered by its original owners in 1964
I suspect that the bars in the photo below are in the cabinet above the refrigerator. I have no idea whether they are OEM or if they were owner added, but they would make a nice location to hang dish rags and dish towels for quick drying and easy accessability.
In the photo below, if what you are referring to is the aluminum arm that the lamp is sitting on, it is a swivel mount for a small portable television. I also suspect that you might have aluminum "L" brackets hidden by the drapes that would support the outside frame of the hammock bunks - - these would be another part of the mounting devices that are shown in another of your photos.
In the photo below, the device in the top right corner is another hammock bunk bracket. I suspect that just out of range in the lower left of this photo is where you will likely find an aluminum "L" bracket that would be the attachment point for the outer rail of the hammock bunk.
Stellablu has the only photo posted in the gallery that I have seen of an original installation (in storage position) of the cabinet bunks - - the hammock bunks in my '64 Overlander were stored in one of the wardrobes. It seems that there were several variations in the hammock bunks over the years. The "L" bracket for the sidewall support of the hammock bunk frame can be seen in the photo just to the right and slightly below the reading lamps. Stellablu's photo is below:
Good luck with your investigation!