Yep...as yarddog pointed out, it was actually a successful design, that kind of died on the vine due to the dawn of the jet age, but its intent was to provide long range escort to B-29s going to Japan (and later B-36s should the war have lasted that long). The B-36 was originally designed to bomb Japan from bases in Hawaii, and the Twin Mustang was going to be it’s escort, so you’d need two pilots to make the round trip.
We had a virtual aerial menagerie flying over us everyday -- but most of them were B-36s and P-82s. Plus, we also got all the F7U Cutlass traffic. They were being built at the Chance-Vought factory over in Grand Prairies, but the adjoining Naval Air Station either wasn't finished or couldn't handle them. As a consequence, the completed F7Us were disassembled and trucked over to Carswell, where they were re-assembled and tested.
In retrospect, those were three exotic designs.