5: Build the Face Frame
6: Attach the Face-Frame Cleats
7: Mark and Cut the Windows for the Sides and Back
8: Trim the Windows of the Side and Back Panels
9: Secure the Grilles to the Side and Back Panels
10: Attach the Floor Supports
11: Mark and Drill Pilot Holes on the Side Panels
12: Attach the Sides to the Face Frame
13: Insert the Floor