Here is the threshold between old and new:
When complete, this opening will frame the trees and distant sky like a picture:
Perhaps this model will depict it more clearly:
The roof trusses were delivered just as the framing was done, so they are now promptly being fitted into position. As soon as they're up, the old green roof sheets will be removed and a brand new roof (of the non-leaking variety) will be installed. And hopefully the possum that is currently residing up in the roof cavity will leave to find a new home.