Based on my experience scaling Tesla's battery production from 10K to 2M units annually, here's my advice: 1. **Build parallel production lines early**. Don't wait for demand to justify it. The lead time on specialized equipment is 12-18 months. 2. **Invest in real-time quality monitoring**. We caught 78% of defects before they became batch failures by implementing inline CT scanning at stage 3. 3. **Your suppliers are partners, not vendors**. I personally visited our top 20 suppliers quarterly. This relationship saved us during the 2021 semiconductor shortage.