There is absolutely no way those fibre cabinets will be connected to a tiny exchange that only serves 540 people. They will run the fibre 10 or 20 miles to a large exchange
Perhaps 'via' the local exchange to the handover site
Not that I can see. Not sure where your data comes from. "Exchange 2" is not the same as Cabinet 2, which is in the village of Slapton, and that's not on your map.
But our NGA has already been installed, so...isn't this all moot?!