Thank you Robert for your diligence. Your contact list is helpful and I'm baffled as to why no one responded. I've long wanted to get more information on RMT but have not had the time and energy to devote. Maybe your quixotic venture will inspire some of us to come up with some new angles of approach.

 Intriguing idea to see more of the CBSRMT studios. Have you tried contacting CBS radio and asking about their historical archive if any? They may send you to the Museum of Broadcasting which also may have stuff. Good luck on your quest.