The cornice box was constructed from 3/16 inch plywood. I used easy to handle 2 foot by 4 foot pieces from Lowe's. To give it strength, the frame was made with 1.5 inch by ½ inch rectangular wood molding. Each piece was 8 feet long and cut to length. After making the window measurements, I made a drawing showing all the parts and how they fit together. I used a finishing nail gun to assemble the box. If you want extra strength, the edges can be glued before nailing. If you don't have a nail gun, you could use furniture wood glue and clamp the pieces together. This will work, but it will take longer. Next I checked the box to make sure it fit up against the window.
Dee—that’s a great tute for making a fabric covered cornice board! Thanks for sharing it with my readers. I think covering up the radiator-making it a window seat would be a great idea. Great looking room, cute sign about the bears! Y’all go check out Dee’s blog, she’s a very talented lady!