Yes, but you wouldn't be able to see through the wall, you'd see the wall on which the zeppelin is attached to. Here's a crude Sketchup model to demonstrate this very boring point that I'm trying to make...
When you stick two halves on an object on both (or one) sides, you can obviously see that it doesn't go all the way through. Even if there was a fake hole in the wall, and there was a little gap around the edges of the zeppelin and the fake hole, you would still be able to see at some angles that the wall is solid and the illusion would be ruined, surely?
Whereas when there is actually a hole in the hole (albeit a large one in this example), you can see that the object does actually go through the wall, and protrudes out of the side, like you're suggesting. So although I could be wrong, I don't think half of a Zeppelin would look good smacked against that part of the wall unless they can convince the eye that it does indeed go all the way through. Even if they make the zeppelin high up and the "hole" only just big enough to fit the half-zeppelin into, I don't see that looking good. Or you could set the half zeppelin deep enough into the wall but without going through it, but even that wouldn't work for all angles. So yeah, that's why I'm saying it would make more sense to me for the zeppelin to go all the way through, rather than half of it tacked onto the wall, which would look terrible. The only solution I can think to combat this, on the top of my head, would be the drape fabric or something along the sides of the object, with the zeppelin peeping through, but again, I don't think that makes sense.
Of course I could be wrong, and Phantasialand might do it and find a good way of making that work. But I just don't see that yet, and Phantasialand would want everything to look perfect. That's why I'm finding it hard to understand why some of you guys think that half of an airship stuck onto a wall would look in any way convincing. And of course, it seems a bit dumb to have a hole in a wall which is designed to block sound from travelling.
Anyway, somebody on Phantafriends has posted another shot of the new theming on the Wuze wall...