I'll be casting 4x cills over the weekend, trying to replicate these;     The cills I'm tackling are the 4x upstairs ones (front 3 and 1 to the side). They're 1x brick tall and don't look to extend wider than the opening massively, perhaps by 50mm, or 2" back in the day? Similar the overhang isn't that much either, perhaps by the same measurement again?   From the cills we have left, they look to be Yorkstone so I'll be taking inspiration from a previous post, shut