NACA 127 was used in the late 1940s as a test bed, a flying wind tunnel of sorts, to test supersonic jet designs. Special probes and various models could be mounted to steel plates screwed to the gun bay covers. These probes fed data into special recorders located in the gun bays and cockpit where the fuel tank had been located. I had a chance to help in the restoration of NACA 127 several years ago and had a blast building this model of it. The entire cockpit, wheel wells, and gun bay are scratch-built.
(Click on the thumbnail
for an enlarged image)