Sky Tech apparently made a 1/144 scale LZ-49, long out of production. This is what it says about Sky Tech:
SkyTech Models: out of business
Manufacturered airship models, 2-5 feet long, in kit and finished forms. This was, almost literally, a one-man operation. SkyTech made a number of kits for which they were the only known source. I hope they make a come-back. Last known address was a small shop in a mall: 2373 N.W. 185th, No. 290, Hillsboro, OR 97124 USA.
Otherwise, the largest I've seen are some rather fine card models, though nowhere near 1/72 scale (I have a 1/200 scale 'Hindenburg' which I bought from the Zeppelin Museum shop! Haven't built it, though...).
Some ten years ago there was a chap in Germany with too much time on his hands: he built himself an excellent 1:72 Zeppelin and showed it on the annual Modelshow in Dortmund. The year after that he showed he still had enough time, as he had started a wooden hanger for the monster! I wish I had had a camera with me that day...
As far as I know he did see that what he had built was a bit too big for his house (for anyones house, I guess) and reportedly the model is now in the Zeppelin Museum in Friedrichshafen, the best place for it to be actually.
Wow, that is awesome Grzegorz! Thanks for finding and sharing that!
113.5cm long! 200 quid!
Speaking of Great War zeppelins, I bought 'Hell's Angels' on DVD the other day - only the most awesome zeppelin-bombing-London sequence ever filmed! Twenty minutes of sheer brilliance!