Wood Hallway & Drop Window

Part of our school haunt this year will consist of a 16' hallway that will include 1 or 2 drop windows, (haven't decided quite yet) along with a 2-way mirror as you enter. In the image below, you will enter on the bottom right of the image and walk toward the 2-way mirror, turn right and make you way down the hallway. Air will be used to divert attention from guests as the drop window (DW) is labeled on the left side of the hallway. Never having used wood for our haunt walls I have been planning on using plywood attached to wooden frame, braced on the corners and on top in order to make the walls. Is there is easier more economical way to build freestanding walls? Also I have watched countless videos on You Tube for the drop window, searched the Internet and on HF.com. What is the suggested way to build one? Any preference or suggestions?