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Cargoduck: 672 Cargo, 10.7k ship

[Update] The parcel number of delivery missions has been significantly reduced in patch 1.14.9, the best paid ones being 48 now, compared to 176 previously. Thus the huge cargo capacity of the Cargo Duck is no longer needed, instead it is recommended to use the smaller Cargo Duckling.

Airship normally can carry only a third of its lift in cargo mass. Most vessels which can transport lots of cargo are usually very slow, or make use a lot of rather expensive float stone. However, I've now fund found a solution, which as far as I know has not been posted yet.
This vessel can carry 672 cargo, the maximum you can get from any fort's missions. It's empty mass is only 10.7k, thus it can reach a speed of 11.26. It also sports a magnetic drive, allowing even faster speeds. Technically it is an airship, however when fully loaded it will submerge mostly and turn into a ship, leaving only the part in the picture above the surface. For this reason it got its name 'Cargoduck'.

It's main usage is of course to get four 168 delivery missions from Tsuchev Ruins. Your delivery list will then look like in the last screenshot, often you'll drop off two or three shipments at the same place though.
The Cargoduck comes with sufficient bite to defeat stray AI ships or D (and possibly C) class hunts. Anything above is not recommend, especially considering that it isn't armoured.
Group 3 triggers the two auto hammers, which cover all vital components: balloons, engines, dragon tails, weapons (except the front auto turret) and the large pressure well. Group 4 engages the magdrive.

Usage advice:
- With full load won't be able to reach all delivery points, particularly in the northeast of Burrow there is a bay you can't enter. Thus I'd recommend to do this delivery later.
- Once you are down to four deliveries (224 cargo) you can take off again and on the last three (168 cargo) you can stay in the air.
- Park your ship in/above the ocean at the tunnel of the fort before accepting missions which exceed this, otherwise you might get stuck.

Required research:
- Medium Airships
- Large Balloons
- Flask Engines
- Pressure Storage
- Tail Propulsion for Dragon Tail
- Magnetic Propulsion
- Precision Weaponry for Longnecks
- Dragoon Hauler (you can replace them with other dragoons if you haven't unlocked them yet)
- Exploration Tools (you can replace the spyglass board with a different board if you haven't unlocked it yet)

PS: When fully loaded you can also use it as a makeshift submarine (just press shift). Don't worry, should you run out of steam you will surface automatically, as long as your balloons are not damaged.