Interesting concept if they could have solved the vibration problem. Robert
"The aircraft was designed as Messerschmitt project P.1073 in 1941, and was originally conceived as a cheap and simple escort fighter, to either be towed aloft by a Heinkel He 177 heavy bomber or Junkers Ju 388 using a semi-rigid bar (the Deichselschlepp, which was also considered for towing auxiliary fuel tanks), or carried on a Me 264 in a Mistel type fashion. Three versions were proposed: an unpowered glider, a version powered by Argus pulsejets, and a version powered by a Jumo 004 turbojet.[1]"
Proposed roles
"A wide variety of roles were suggested for the aircraft, ranging from a point-defence interceptor, to a version with folding wings and twin pulsejets to be launched from a catapult on a U-Boat,[1] to a ground-attack aircraft. Various modifications to the prototypes were made to evaluate their suitability for these missions, and different engine configurations were tested. Despite all this, the vibration problem simply could not be overcome and the program was abandoned in early 1944, even as production facilities were being readied to construct the aircraft at the Jacobs Schweyer sailplane factory in Darmstadt.
According to Thomas Powers's book Heisenberg's War[4] the Me 328 had been intended as a parasite bomber for the Amerika Bomber program. It was to be carried by or towed behind either an Me 264 or a Ju 390 to attack New York. Plans for this tactic were hatched from a meeting between Generalfieldmarschall Erhard Milch and Generalmajor Freiherr von Gablenz at Berlin on 12 May 1942. After release, the Me 328 pilot would release a bomb over Manhattan and then ditch at sea near a U-boat."
link
link 
is back from Council of Five Nations.
LOL. Robert