I have been looking forward to this GB.
My entry is the Bell YFM-1 Airacuda, a 'fighter cruiser' that first flew in September 1937. Not a success with only 13 production aircraft being built.
Not sure I would have fancied being the gunner sitting in front of the engine. The gunners cockpit reportedly filled with smoke when the 37mm cannon was fired.
A search of youtube produced a short film of the Airacuda in action.