Earlier, Slingsby wrote:

I assume the technique is similar
for all German designed gliders."

And Dave Nadler replied:

Very bad assumption...

And Slingsby responded:

Could you please explain some of
the different spar construction
methods used by the different
German manufacturers? Which ones
use a spar which is constructed
outside of the wing assembly process?

To which I say:

Slingsby, I think you kind of slipped a groove back there. You started
off by talking about "German designed gliders," but after Dave
responded you changed the topic to German manufactured gliders.

Design and manufacture are two different things.

A survey of the Akaflieg Web pages might show a couple of examples of
German designs with the characteristics you are talking about. What
then?

Bob K.