Smart Factory Retrofit ROI (Electronics/EMS Line)

Propose a retrofit plan for a small EMS line in Lanzhou: feeders, AOI, ICT, reflow with energy metering. Return a unit-economics tear-down: Inputs, Assumptions, Savings buckets (scrap, changeover, energy), Capex, Payback months. Add a 3-tier roadmap: Lite, Pro, Full.