Usually sea is being reclaimed for more land estate. Here we have an opposite example. Upside to a whole new huge basin is more pier estate for fitting out large ships like carriers. Perhaps even two such carriers could fit in such a basin, for various maintenance work in the future. And the basin can be closed and protected from both sabotage and espionage, more so than what protection 001 enjoyed when sitting pierside in Dalian.
Which brings me to the question: why haven't they just constructed a dry dock right there? So they don't even need to move the ship parts a lot, outside of the basin? There seems to be plenty of space for all of it. Yet they seem to have decided against the drydock. It seems way too late to construct a drydock, now that is has been flooded.
Perhaps a drydock could be made alongside the current assembly area. But wouldn't we have seen such construction by now? Seems like a lot of work to excavate a drydock and furnish it?
(additional cranes or small transport docks in the basin could be used to transport pieces)
Or how feasible would a large floating dock be? Similar to what Kuznetsov had in Russia? So the ship is fully assembled where it is now and then moved to a huge floating dock. Which is then flooded inside the basin, the ship is lowered into the sea and it stays right there in the basin for all the fitting out.
Some of these ideas are rather wild, I know. I'm just throwing them out there, to see if any will stick.