I don't see the copper nails holding them down

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Are you going to take a couple of tiny pieces of copper strip to represent where one or two of the slates had been replaced in the past on the first part of the roof?
What is the actual size of the Spanish Tiles? There is a block of 1920's store fronts in a not to nice neighborhood on the north side of Richmond, Va with a short bit of Spanish Tile roof-work which are just crying to be modeled as a row of flats behind a street car in the 1930's, and if close enough, I might have to add the mould to my kit.
Lawton