As far as I know this might be a legend.
There are no official known drawings on this project that is also not mentioned in the “Nurflugel” book by Reimar Horten.
Perhaps it was a Junkers-Horten common Project as both companies were forced to work together by Göring by the end of March 1945.
The Horten brothers might not recognise this project as their own, due to the tailfin imposition.
I have not been able to find any bibliography prior to the sixties. The project was mentioned for the first time in “German Jet Genesis” by David Masters, Jane’s 1982, and its description in the book “The Horten Brothers” by David Myhra (under the name Junkers Ju EF Project 140) is very confusing.
The best published work on the subject is on page 71 of the book “Luftwaffe Secret Projects-Strategic Bombers¨ by Dieter Herwig and Heinz Rode that, being a Midland Counties publication, we cannot reproduce here.
You may see two superb drawings by Borovik that were published here http://www.secretprojects.co.uk/forum/index.php/topic,4973.0.html
Please see attached a drawing of several Horten projects published in “Modell Fan”, Juli 2001, for being of general interest
