@ Don - yes, it makes a welcome change
@ dunarispace - I am a client of GPM's e-shop, too. They have good prices for kits, very decent prices for p&p and a good service.
There is a truckload of flying buttresses: 20, to be precise! A strange feature is that they don’t glue directly on the roofs. They pass through holes in the roof parts and glue on a flat surface below the roof level. Maybe the holes are large enough to cope with both the buttresses and the paper thickness in the gluing tabs. Anyway, I guess it will be convenient to slightly enlarge the holes…