Earlier, Sport Pilot wrote:

fiberglass service corridor

Do you mean conduit? Or is that aviatiou
double speak to confuse us mere mortals? ;)

Yeah, I mean what you'd call conduit. But I didn't use that specific
word, since whenever I hear it I think of grotty, heavy, steel or PVC
tubing used for household wiring. And nobody wants that stuff in their
sailplane. Even Class 200 thinwall irrigation PVC is heavier than you
really need.

What I have in mind is more in the manner of a one-ply fiberglass
hat-section that gets bonded to the inner surface of the aft fuselage
before bonding the right and left shells together.

And besides, the term "Jeffries Tube" has been co-opted by Star Trek as
a way to turn ensigns into plot complications...

Thanks, and best regards to all

Bob K.