1st clue ?
Although the aircraft's performance and handling were good, it suffered from excessive vibration, and overheated when it was on the ground. Further development was abandoned late in 1947, with the prototype having flown only twice" ?

Crap, I know this one I think. I read about it in Jim Wincheser's The World's Worst Aircraft. Can't remember which one it was. Was it the Aerocar?

Not the Aerocar.
"Two air-cooled piston engines were buried in the rear fuselage, driving a single eight foot diameter twin-bladed propeller, mounted behind the empennage via driveshafts taken from P-39 fighters. "

Used 2 ? Continental E250 six-cylinder air-cooled piston engine, 250 hp (190 kW) each

So no stewardess for last week.
The answer -- https://en.wikipedia.org/wiki/Douglas_Cloudster_II

This weeks headache.

Have fun

Love the white-walls on the Cloudster, that's real class!

1'st clue
"The aircraft was redesigned to include two machine guns in the wings and another machine gun mounted in a flexible mount in the new rear cockpit. ???

MAC-1 NX-2491

Well done it is.
LINK -- http://www.axis-and-allies-paintworks.com/e107_plugins/forum/forum_viewtopic.php?12776.post
And the prize of course.