Lumber storage is spot on, I think especially for a basement shop – I used to store my lumber at the furthest point from the outside door, and it wasn’t until I moved it closest to the door that I realized how much of a difference it could make. And sheet goods are starting to be stored and broken down in the garage more so I don’t have to fight them into the basement.
Let’s be clear about one thing: No workshop is perfect for everyone. If there were, I could simply give you a precise plan to follow with clear dimensions. Every person who comes to the hobby, avocation, or profession of woodworking has his own particular collection of tools and his own peculiar work style, skills, and desires for the kind of woodworking he wants to do that gives him a unique approach as to how he will lay out a shop: where the tools should go, where lumber and supplies are stored, and how much bench area he needs.