On top is what is called a "Park Avenue" boom. It is made of carbon fibre and the main sail is resting in it.Handsome!
Can you explain the tubal structure. Is that around a sail? Do you have that from the side?
Also, the wide black around each of the windows? Is that a rubber gasket or what?
The roof structure is made of carbon fibre with rubber seal around the glass (for waterproofness and absorbing dilation due to heat during the day)
For other viewes, check-out the book! Livre Chrisco