Now that the silicone has cured, the dog bone shafts have been installed and weight has been attached to the shell. The nylon frame is rigid enough to support the weight of the motor, but additional weight has to be added to the shell or the chassis will begin to sag, especially at the middle. At this point the entire model weighs 9 ounces, but after lighting is installed I'll start filling in the shell to get it up to 13 or 14 ounces.