Longitudanally?

Yes, longitudinal planks.

Not like the prototypes, then, which
were scarfed rings, then?

I don't know about that. The production Baby pods I've seen seemed to
be made of fairly large pieces. I know the right and left halves are
scarfed together, but I don't recall how many longitudinal sections
there were. I think it might have been one big piece except for the
aluminum nose bowl and the little stinger below the boom. I do know
from photos that the pylon connecting the pod to the wing and boom was
left to be skinned by the kit builder.

Again, your best bet for the real deal is Jeff Byard. He has photos of
the Baby gliders under production; it should be pretty easy to figure
out specific construction details from the photos.

Oh - and if you're serious, I have aluminum booms from RS-15 kit
production that might do for you. They're 6" dia, which is larger tha
the Bowlus booms I've seen, but probably reasonable for that
application.

Thanks again, Bob K.