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@dooks
True. But I think a solid 2.4m plank of 18mm x144mm pine attached at 45 degrees or more (relative to the elevation) is going to be better than the current hollow plastic sill at 90 degrees. I can work out how much angle I can afford based on the available width of wood and how far I need it to protrude.
I think a solid chunk of timber cut into a prism wide enough to protrude 3" or more and the full width of the window is going to be prohibitively heavy. It's also going to be a ball-ache to source and harder to fit.
I could be wrong but the more I think about it, the more two right-angled brackets with triangles of wood to set the angle attached to them, with a plank screwed to that is the best solution. All you'd have to do is cut the inside edge at an angle corresponding to that of the mounting to make it flush with the facia.
*gets out pencils.