Airstreams of your era came from the factory with the option of a tight double bed on one side and a slim cabinet on the other. That gave enough space for an off-center walkway.
You do not have a wide body ... that came in in 1994. With your 8' wide trailer, there isn't really enough space for a queen. Thee is less than 7' width inside and a 60" wide queen takes more than 60" when made up. Your walkway will be tight against the curved side of the traile with limited headroom. The queen will be a bear to make up.
I changed my crosswise queen to twins and it was the best change I have made to my trailer. if I were you, I would stick to the twin layout. The twins are nice and wide and really comfortable.
John W. Irwin
2005 Classic 28 "Sabre-Dog III"
2013 Silverado 2500HD Duramax/Allison LTZ
WBCCI #9632, TAC TX-10