Both my brother and my sister helped install the soffit for the ventilation ductwork. We finished two ten foot sections.
John recommended building it with the metal studs and he showed me how to use them. Jean was very helpful as ladder holder and getting tools and screws.
The duct will exit the attic into the metal soffit or shaft.
Under the windows, I will install corian as light shelves. These will reflect the sunlight up to the ceiling and allow it to penetrate the room more fully.
We think this area might need quarter inch drywall to stabilize the studs without being too heavy. With the soffit in place, I can install the ducts and the ventilation system.