Yep you can get the Longships. Their easy to build and take less time. They can place some copper or iron plating on the outside. It will slow them down.
As for the Zeppelin you will have to find the tech for it. Sounds like a quest or major research project. As for the ability- if you get them the engineering of such a mechanization they can build it.
Cool. Okay, we should commission the 4 longships. How about 2 armored, 2 w/o extra armor?
I will keep an eye out in game for any Zeppelin info!