I have been through many iterations of the 737 windows. Trying to get all the angles right. Now I have a proven design and with CAD all the angles match perfectly. The first sim saw me create timber frames for the windows then try to fit the trim around the frames. This method alone took weeks per window.
If you want a much simpler way to create the window frames and internal trim in one go, see my Youtube videos or follow the guide and plans in the shop. These are much more detailed, but simpler.
Below are the general window dimensions that will get you on your way. These are aimed towards matching the rest of my sim plans.