We were in need of doors for the entryway. Our previous boat (like our current one) had slats that needed to be taken out in order to exit. I have become quite proficient in some jump-ups (jumping and pushing myself up and over the slats) but having doors is such a better feature. I told my father-in-law that he made a lifelong dream come true - I did always want french doors in any home that I lived in. Now that my home is a boat, these are perfect! The bay window.... not sure if that's doable.
From inside, we have three latches that allow us to secure the doors. There's also weatherstripping that my husband placed around the frame so that we are minimizing draftiness. The overhead sliding hatch fits perfectly over and to the outside of the two doors, which provides even more stability to the doors.
From the outside, our pooch has become quite proficient at jumping over the entrance onto the first step inside. That's proven to be wonderful especially on muddy or snowy days - the first step becomes a paw-cleaning platform before we allow him to run around.
It's a great addition : )