They sound like Bomar portlights. I just bought some to replace some leaking fixed ports I have. Mine also install from the inside but use 12 number 12 screws to install. Your right about the trim piece, it is there to "dress" the window up. They recommend using 5200 to install the windows, but I wouldn't. I plan on using 4200.
I have instructions if you need them.
I had a dream, I was sailing, I was happy, I was even smiling. Then I looked down and saw that I was on a multi-hull and woke up suddenly in a cold sweat.
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