Design a rebuildable Minecraft unde...

Design a rebuildable Minecraft underground farm with exactly 135 crop plots in a 15x9 grid. Each plot is 5x5 farmland with 1 water source in the center. Use 1-block paths between plots and 3-block main corridors every 5 plots plus a central cross corridor. Keep layout fully walkable, symmetrical, and modular. Use a clean modern underground style (modern laboratory style) (black/white/gray). Include even lighting for crop growth. Provide exact block dimensions, a top-down grid layout, and one repeatable 5x5 module. No artistic descriptions, only practical building instructions.