Kosh,
If you're looking for something really technical, this one's hard to beat.
Lewitt, E.H.
The Rigid Airship. A Treatise on the Design and Performance. London (UK), Sir Isaac Pitman & Sons, 1925. 283 pp., illus., figs.
This one will tell you how to design and build your own.
Is your garage big enough?
Where can you get gold-beaters skin nowadays?
Imagine showing up at Oshkosh in your very own Zeppelin!
VBR,
Ira