I have another Skyray-related question and I think this is as good a place as any other to ask:
A USAF Project RAND research memorandum dated May 20, 1960 states that in the interim period when Convair's MX-1554 was still in development and the wartime fighters were obsolete, the U.S. Air Force considered procuring an interim fighter. Among these were the Republic F-91A Thunderceptor, the North American Sabre-45 (forerunner of the F-100), an interim Convair Model 8 proposal with a J40 engine (which led to the F-102) and... the Douglas F4D Skyray.
I would be very curious to hear or read about the Air Force Skyray proposal. Any hints? Possible sources?