That was a good one !. Wasn't even sure which way it supposed to be pointing in your piccie, and it looked like a prop blade attachement to the right of the pic. At one point, I'd convincved myself it was a jet pod from a twin airliner and the body was pointing from left to right, then I was sure it was a P-38 with the intakes under the engines.....then you said it was unusual ! Very sneaky one, well played.
Actually there were three built. The first crashed after entering a flat spin, the second one is the one you have a picture of and the third crashed at Wright-Patterson during an airshow, killing the pilot and one or two spectators.