A tip of the Dutchmans' cap . . .
to you Sugarfoot for locating and posting my earlier remarks on California "whale tail" Airstreams.
I never did any survey of rear end cap interior panel construction, so that will have to be determined from observations on a year-to-year or trailer-to-trailer basis. A straight-on rear exterior view of the Dutchman's cap has a Moderne monumentality reminiscent of Hugh Ferriss' architectural renderings:
Fred Coldwell, WBCCI #1510, AIR #2675
Denver, Colorado - WBCCI Unit 24
Airstream Life "Old Aluminum"
Airstream Life "From the Archives"