They loaded that mobile catapults and the CCA (mockup?) onto the container ship! Those CCAs might not necessarily be solely intended for 076.
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When discussing this last night in CHH, Shilao likened this setup to merchant aircraft carrier of WW2 used in the Atlantic. One interesting way to frame it that Shilao used is "think of CCA launched from this thing not as unmanned fighters but instead surface to air cruise missiles". You have that catapult on your ship and a couple of CCA in storage and if you sense you're going to need CAP you launch one.
Of course catapults are by nature versatile, so air superiority CCA doesn't have to be the only craft onboard. You could also use it to launch reconnaissance or even kamikaze drones instead.
They again reiterated the claim that the project's goal is intended for a post-apocalypse world. Shilao painted a story where in a Fallout-isk world, descendants of China might decide Darwin is a good place to have since it's a good harbour and not contaminated with fallout. But upon realising the natives might have a few working F/A-18 left they load the catapult trucks and CCAs onto the container ships. Having said that, Shilao then also repeated Xi Yazhou's point that as wild as the projects goals are, all the less wild uses people are imagining like convoy escort or commerce raiding are of course no less valid.
Finally, they hinted that the relatively small container ship chosen for this should probably be considered to be a "minimum viable product" for this size-wise and larger container ships would make for better conversions.
There was also this humorous conversation between Ayi and Yankee about people (Ayi included) now heading to this park to take photos of the cargo ships, the CCAs and 076:
Ayi "there's no sign at that park saying we can't take photos!"
Yankee "there's no sign at the park saying MSS can't arrest you either."