I'm pretty sure 004 was built in three shifts; its construction speed is astonishing. After all, it's a key project for the 2027 centenary of the founding of the People's Liberation Army.
I think the current situation is far from the worst for China. If the South Korean right wing, led by Yoon Seok-yeol, remains in power, and the US Democratic remains in office, and a decisive battle continues in the Pacific, then China will face the WPTO (Western Pacific Treaty Organization), a military alliance comprised of the US, South Korea, Japan, the Philippines, and Australia.
South Korea will sell KF-51, K9, K2, K239 MLRS, and KM-SAM to Taiwan; Japan will provide the Mogami-class destroyers; Taiwan will use the vast foreign exchange reserves of TSMC for funding; and Australia will provide raw materials for payment. Meanwhile, the US, whether through direct sales of high-end products like THAAD, PAC-3, and F-35s, or through revenue sharing from subsystems such as the MK41 and SPY systems on destroyers, or through NVIDIA, Starlink, and Paladin systems, or even more directly through forced revenue sharing, will firmly remain at the top of the value chain.
Furthermore, NATO member states are or have already been significantly impacted by the US and South Korea's military industries. With Japan's inclusion, whether in the hypothetical scenario or the real future, they will all become cash cows for the WPTO in the air, land, and sea domains.
For China, the silver lining is that with South Korea and Australia's wavering stances, and the strategic retrenchment of the US under Trump, WPTO irl is largely becoming similar to the Petite Entente.