What bespoke means here
It means the house will work outside its own range, and it means nothing beyond that. Frassino knits three sweaters in two yarns and four colours, and the smallness is the argument: a short range knitted a thousand times is knitted better than a long one knitted once each. Bespoke is the door for the man the range does not fit. It is not a second range standing quietly behind the first, and it is not a way to have anything you like as long as you pay for it.
Three things come through that door and they are the three below, in the order of how far each one takes the house from what it already does well.