Sail box view of the inside before 3rd panel installed
Panel for 'C' rig and the 'B' rig on the back panel. Also slots for keel and rudder
Here you can see the 'A' rig on the inside of the front panel and the 'C' rig located on the inside panel and the 'B' rig on the back panel as well as the keel and rudder.
Below - you can see this with the inside panel closed and only the 'A' rig accessible.