Possible fix for cold interior aluminum walls ...
Back in the late 1950s and early 1960s, when all Airstreams had Zolatone painted aluminum interior walls, the most costly "International" trim models had a ~ 2 foot high padded fabric panel lengthwise along the outside metal wall of the bed(s). The padded fabric kept the cold metal away from the sleeper and provided some "warmth".
An easy fix for today's similar CCD concern would be to add a padded fabric panel along the outside wall of each bed. Cotton batting could be used for the padded insulation. Match the interior factory fabic, compliment your bed cover, or use a neutral color. Any of them would separate the cold bare metal wall from the outside sleeper without overtaking the clean interior look.
Fred Coldwell, WBCCI #1510, AIR #2675
Denver, Colorado - WBCCI Unit 24
Airstream Life "Old Aluminum"
Airstream Life "From the Archives"