Each item is made and attached to the board separately. Each piece will overlap each other 2". The jabot finishes 9" wide (on the "face" of the mount board) x 42" deep. The side section will lay 2" behind it. Each side section can be 12" or up to 20" wide x 20" deep. The scallop section can be 12" or up to 20" wide x 16" deep. Alterations for depth are included (width is not). Add more scallop sections for large windows. In order for them to overlap you must use odd numbers (1, 3, 5, etc). The scallop sections could also be used without the side sections for very small windows. A small cord sews into the seams.