Assuming that the Maramu is built similarly to her younger sister, here is what we did replacing all the windows on our Super Maramu. https://fetchinketch.net/boat-projects/a-new-clearer-view-of-the-world/

It was one of the more difficult projects we have undertaken.  No single step was difficult from a technical standpoint, but it was a LOT of work. As much sweat went into it, it was definitely worth it from both a cosmetic and functional standpoint.

Bill Kinney
SM160, Harmonie
Hollywood, FL, USA