I Live in a 1930s semi. The window in the lounge has a half bay window and the wall has a plastered curve. Currently the window has an ugly PVC window sill which in mitred. I'd like to replace it with a wooden window sill that matches the curve of the wall.
Can someone please advise on how to work out the dimensions of the curve so that I can cut the wood to follow, as closely as possible, the line of the wall but with a 2-3cm protrusion.