Jo Ann,
The Holiday reminds you of your Bubble for a good reason. According to Fred
Coldwell's article in the VA (Q3 2003) (AKA the Shaggy Dog issue) "The
efficient Holiday interior layout was carried over into the 1955-57 Bubble,
which was Airstream's updated version of the Holiday."
The sewer hose holder may have been a dealer item. My 1960 Overlander had
nearly identical holders.
The stove top is original (see pic in Fred's article)
It's a cool trailer.
Scott