Hi Nick,
Without being able to add any facts regarding the events detailed, I have found it interesting to note that the only images of Breguet machines featuring metal clad fuselages that I have come across, have been those equipped with the horizontally mounted Salmson Canton-Unne radial engines, as per the attached – this photo apparently taken at Hendon. Would you know if ‘312’ was equipped thus or did it have a conventionally mounted unit?