As for the main topic, I found a nice little complementary piece from the July 1960 issue, page E37, in the "Chain store building continues on schedule" article that discusses then-current design trends. Apparently the marina design was also created to placate the residents in the area, who originally fought the presence of the supermarket.
Also interesting to note that Chain Store Age already gave the store plaudits for its design merely a year after opening, specifically highlighting the glulam beams as a key to the unit's beauty...

more: http://dtcwrt.earlracing.com/stores/csa ... ly1960.jpg