Thank you for your comments Gary and Stephen.
Paul - I have seen somewhere a 3d printed kit of a gondola but cannot remember what scale, where or what manufacturer. If I were to do it in that scale I would be more inclined to build the gun emplacement on the top or, in a smaller scale, the gun emplacement of LZ54 (the one involved in the King Stephen Incident) with the whole crew huddled in and behind it.
Nigel - 1/72 would probably be the easiest scale to scratch build one + figures would be easier to do but at that scale a N-P class Zeppelin would be about seven and a half ft, a Q class or E class Schutte Lanz would be 8ft and a R - V class 9ft. I think 1/144 like the Hippo kit would be more practical but still very impressive.
Alan