Since this post got popular, here are my sources.
1. Casting:
https://www.csis.org/analysis/empty-bins-wartime-environment-challenge-us-defense-industrial-base/
https://features.csis.org/preparing-the-US-industrial-base-to-deter-conflict-with-China/
https://www.statista.com/statistics/237526/casting-production-worldwide-by-country/
2. Shipbuilding:
https://www.twz.com/alarming-navy-intel-slide-warns-of-chinas-200-times-greater-shipbuilding-capacity
https://www.foxnews.com/world/chinese-shipbuilding-capacity-over-200-times-greater-than-us-navy-intelligence-says
3. Drones:
https://www.csis.org/analysis/why-chinas-uav-supply-chain-restrictions-weaken-ukraines-negotiating-power
https://dronexl.co/2025/04/16/us-drone-makers-struggle-to-break-free-from-china/
https://cepa.org/article/reality-check-breaking-free-from-chinas-drone-ecosystem-is-harder-than-you-think/
4. ~1 billion weaponized drones / <1% of assembly capacity:
https://warontherocks.com/cogs-of-war/factories-first-winning-the-drone-war-before-it-starts/