https://www.marinedepotdirect.com/bronze-rectangular-portlights.html
This came up in a Google search. Not sure if your dimensions are cut out or finish.
I'd be concerned with reusing old aluminum, it can be hard to keep finish on it long term once it has had corrosion. Some cast aluminum is better than others.
Let your admiral know it's great seeing her involved with the restoration work!
Cheers Richard