You're welcome.
The appearance on the four fixed oval windows in my master stateroom had deteriorated several years ago.
My solution was to remove the windows, provide the Plexiglass to a local plastic fabricator for duplication, then I reinstalled those parts.
The oval stainless exterior trim plate, plus the screws, plus the interior nut plates were all reused. The interior nut plates are small and easy to lose, such as between the interior trim and hull.
The interior trim must be partially removed to expose the interior nut plates, to permit reassembly.
An appropriate sealant must be used when replacing the windows.