Haunted-dimensioneer, Cees, discovered a glitch in my Gatehouse instructions. The window inserts (parts 4 & 5) DO NOT get inserted into the main building (part 1 & 2)! They are are suppose to be attached behind parts 10 and 13, THEN attached to 1 & 2. Thanks for catching this, Cees! Everyone else, sorry for the glitch! The instructions have been revised.