I recently was directed to an amazing link which shows dozens of pictures of a 28mm zeppelin as it was built, step by step, by two brothers. It's for a 1930's pulp game, rather than a Victorian steampunk game, but agin why quibble. A cool zeppelin is a cool zeppelin. The picture at the top of the page shows the forward section in an early stage of completion. The one below shows the same section from a different angle and a little later in the construction.
The girders are made with heavy card stock and the exterior panels appear to be cut from cerial boxes. That's a great forward obervation bay, isn't it? There are a couple 28mm figures in the picture as well to give you an idea of its size.
Since this is a 1930's model it includes an aircraft hanger and biplane fighter painted in German markings. That's not relevant to Steampunk exactly, but check it out when you visit the site. They did a really nice job.
Here a close-up from the passenger lounge in the complete model. I love the attention to detail and it's followed throughout this massive model. I think the little model zeppelin in the lounge is a nice touch.
Finally, here's a long view of the completed model. Of course there is no top half as it's used as a complete game environment. Here the link. Check it out by all means.