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As water leaks through the windows' sides, some of it passes to the fiberglass and causes osmosis. Delamination is most probably due to this. I am sure you did not apply enough force to break sound fiberglass. The breaking is due delamination due to osmosis. In my opinion if you are planning to change the hatches, use force and remove them. You have to repair the fiberglass any how, therefore breaking the fiberglass is not really a problem. After repairing the fiberglass make sure you apply a coat of epoxy to the sides of the fiberlass where the hatch is located. In this way you can decrease the possibility of delamination even if water penetrates.
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