Eric Aune meets with Jay Gruden at a new construction site in Missouri to discuss pre-construction planning for mechanical systems. They walk through the layout, discussing plumbing and HVAC routing, materials, and access points. They emphasize the importance of pre-planning, marking benchmarks on the floor, and avoiding stacking trades to provide a better quality product. They also touch on the importance of giving subcontractors space and time to work efficiently. Overall, the key takeaways include the significance of pre-planning, scheduling, communication, and creating a conducive work environment for subcontractors.