Also, it doesn't have the dimensional stability issues that Lexan does.
And you really need to use a structural silicone adhesive, rather than just a silicone sealant. Dow 795 is an excellent one and was mentioned by Mitiempo.
Given the size of the ports, I would recommend going with at least 3/8" thick acrylic...
For the companionway, you can use either lexan or acrylic. Acrylic is a bit easier to work with IMHO and will last a bit longer.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.