Guess it's time for another clue:
Looking for an aircraft:
1) This design only had one flying model built out of two that were constructed.
2) The design had some "out of the box" thinking involved
3) While this design was flown during a war, it never flew a combat mission
4) This aircraft was faster than almost every other one of the class
5) This aircraft was powered by two engines with a unique arrangement
6) This aircraft was deemed "unneeded" due to other less complex and more conventional types coming on line, including one from the same company
7) The aircraft that was accepted from the same company was roughly 40 MPH slower and slightly shorter ranged
8) Like the aircraft that was accepted, our subject aircraft was a single seater
9) Like the aircraft that was accepted, out subject aircraft was armed with either six 50 caliber or four 20mm guns
Good Luck