Hi, Peter...
Welcome aboard...
I've tried to find some information of pictures of the
Schleppsporn 6000 but without any success. However, quite often, the DFS was towed rigidly behind a Ju52, known as
Starrschlepp, as you can see on this link:
http://www.fiddlersgreen.net/models/Aircraft/DFS-230-glider
The rigid-tow
Starrschlepp arrangement, and how it was tested using a Dornier Do17 as tug aircraft, can be seen on this site:
http://www.luftarchiv.de/
On this site, the menu is down the left-hand side. You should select the category
Sontiges Gerät, and then
Schleppverfahren, and that might just prompt you to go out and buy lots more models to make under the heading of
Gliders and Tugs... ! Scary picture time, too, looking back at a DFS230 attached to the tail of a Do17... a little too close, for my liking. You could almost hold a face-to-face conversation with the DFS pilot... !
Henschel Hs126s and Junkers Ju87s were also widely used as tugs for the DFS230, and the Squadron/Signal publication on the Ju87 (ISBN: 0-89747-175-X) on page 35, has an excellent photo of a cable attachment on a Ju87, and a line-drawing diagram, too. These were not to be rigid-tow arrangements.
Hope this is of help. If you're lucky and patient, you might find someone else coming up with the goods on the
Schleppsporn 6000 in due course.
Regards...
Paul