Hello everyone. I have a house full of casement windows that I need to sand down and rebuild to match the bungalow style of our home. We can't afford new windows, but I am having a hard time figuring out if I can even rehab these windows. I need to sand them down to restain them to match, but I can't tell what is the actual window and what isn't. I am hoping that I can remove a lot of these boards (see pics) and just sand the window frame itself.
Anyone have any ideas besides just tearing a window out in mid winter?

Thanks in advance and have a happy thanksgiving.