1. No. You can build them all even during the end game. A sixt rate is a smaller lighter ship then a first rate. You simply uses them different. First rates are the heavy hitters of your fleet and flagships that win you your sea battles. Sixt rates are good for raiding and souting.
2. If they build the right dockyard they will build one. And you can capture that one.
3. Brigs are worthless. Just a waste of nice trees.
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