Update:
I have been working on some operational aspects for the airship. These have been 1) Landing gear and 2) Collecting and delivering cargo.
1. Landing gear
For this I experimented with adding wheels to the gondola. I also came up with a few ideas such as deploying some kind of rigid structure from the nose. In the end I simply added an animation to rotate the wings so the tips ended up a bit forward of the centre and level with the lower back fins. Not sure the wings and fins would be strong enough to support the airship in reality but it looks good ...
Image of wings rotated for landing
Another perspective of the rotated wings
2. Collecting and delivering cargo
An autopilot has been added so the airship positions itself over the cargo. The pilot can then decrease the altitude until the airship docks with the cargo. A marker can be used by the airship's autopilot to deliver cargo to a precise location where it can then be deposited on the surface by the pilot. The building used in the addon and featured in the images below now automatically fixes itself to the surface so it doesn't slide about as it previously did.
In the image below the cargo, a building, has been collected from a landing pad and is now being delivered to a location occupied by a marker called "foundation1"
The cargo is positioned over the marker.