I called Great Plans who is the distributor for Carl Goldberg products. They gave me the phone number for Hobbyco(217-398-8970). I talked with Donna who was VERY helpful.

She said that the 40 to 50 oz listed on the box is the empty weight: no radio equipment (receiver, servos, batteries, fuel tank, engine/motor, or covering). Man what a relief it was to hear that! She did ask me what the total weight was and I told here with the E-flite 25 motor & propeller, the ESC, the 5 Futuba servos & wiring, all the linkages, three wheels, the rolls of covering set on the airplane--not installed yet, the receiver battery, and adding the 16 oz for the motor power battery, it came to about 85 to 90 oz. She said that was perfectly fine. Another whew!