This is my first attempt at making an operating arched window. I did almost everything by hand and made many mistakes along the way. Hand sticking the profiles led to variations in the moulding and aggravating chip out on the short grain sections. The curved pieces are steam bent and profiled. If I had a router bit with a matching profile about half way through I most likely would have used it. Working small curved pieces by hand is a challenge. It gives me a greater respect to the guys who did it in the past. Chip out was a MAJOR problem. Climb cutting on a shaper with a feeder is almost foolproof. Shaping by hand and one begins to feel the fool. At a certain point I resolved to fill some of the chipped out bits.
Another thing I would do differently would be to simply cope all of the meeting members instead of half lapping. Trying to half lap two meeting curved parts was interesting. Still have the screen to make before it can be installed. It has been a lot of time invested in a bathroom window.