This is an existing window. It is actually rectangular. We created a drapery well behind the molding to hide the window treatment hardware. So the valance and moldings are curved but from the outside the window is still standard. Hope that helps.

Thank you and yes that does help. It's almost like an optical illusion until you know what to look for. Well done. And lovely!

Thanks so much!

Can you tell me what the back splash is made out of (the small gray line)?