Latest view of the Convair-240 final assembly line shows seven of the 300-mph, twin-engine, pressurized transport airplanes at Consolidated Vultee Aircraft Corporation's San Diego, Calif., plant. Following these planes on the primary assembly line are more than half a dozen 240 fuselages ready for craning to the final line and nearly two dozen nose, wing, tail, and constant sections in various stages of assembly in their bucks. Behind these units in the assembly department are hundreds of detail