"dirigible designer" wrote in message

Now I just have to figger out how to get those layers of
fiberglass, (matt and cloth), on the inside of the hollow triangular
spar 8-]

Use the opposite of vacuum bagging; pressure bag it.

Make up glass cloth with epoxy squeegee into it, then lay it on the foam,
lay on the release cloth, make up the pressure bag, fold it all up, bind it
on the outside with tape or something, then put the pressure to the bag and
let it cure.

You will have to cut an inspection panel every so often, to get the release
cloth and bag out, but they are easily closed later.
--
Jim in NC