The Henschel PJ 600/67 was the concept from the Henschel-Werke, which was designed in 1941/1942.
The PJ 600/67 was designed without landing-gear and should be brought up using a catapult or Mistel principle (parasite aircraft), and primarily be used against sea targets. Henschel's work already went into the wind tunnel tests and then into the production of a test aircraft when the project was stopped by the Reich Aviation Ministry.

(Artist's view)