We are putting new windows in a house that has marble sills. There is no molding or trim around the windows, it just has a marble sill on the inside. We would like to add window trim, so I guess we will get rid of the marble sill. I'm just not sure if there is any reason why we wouldn't be able to remove it. I'm not sure if it has to do with the way the windows were framed. Does anyone have any experience with this? the home is a 1948 cape cod.