As in Cessna 320 "Skynight" of Southbank Aviation, Albion Park.
AFAIK was only ever a mapping camera ship. Spent considerable time in it late 60s and cross hired from MEB, late 80s
I can concur re the heater, after 3 hours at FL 250 over Adaminaby in the Snowy Mtns in the winter, the guys upfront were cooking and down the back I was suffering from frosticles.!!