This photo shows two things:
A standard module (6' x 2') that was constructed on the floor by my wife and I. Previously, my approach had been to build directly on the wall, a more tedious approach.
The second item is the ledger board on the wall suggested by my brother. This approach allows the connection to the concrete to be "about" right, and leaves the finish leveling to the much easier to adjust module to ledger board connection.