Hmmm. What to do. I have my slate. It's salvaged Buckingham and the size is 14x20. With the 3.5" headlap (not shown here) the slate is looking a bit narrow. A bit too horizontal/rectangular for my liking. I may do the dormers with a slightly different look. Maybe cut them in half and use the back side of the slate so I can make a pattern. Should have bought another sq. of slate. Still it's a beautiful slate and should last quite a long time. Same slate that's on the Smithsonian!