A couple of phrases come to mind to describe this build:
It grew like Topsy
and one my Gran used to say (I don't know why)
Bit by bit, part by part Fanny built her trolley cart.
A lot of research on gondolas and how they were suspended, their shape and how the airship would be powered, believe it or not.
In the end I just went with what I could find and what looked right.
It is mostly bits of plastic card, tubes and so on.
I did buy the ship's wheel from Mr Cropper.
The engine is a reciprocating twin cylinder high pressure jobby. the steam was condensed and recycled to keep weight down. the boiler is of the vertical type and is multi-fuelled, mainly coal.
The Gondola is coming along and it is not fully attached to the rigid airship above.