No but making one bigger than 6.5gal will be messy
If I were you, I'd take the bottle challenge... make a full 5 gallons of beer, then go out and buy some good microbrews (with non-twist tops) and try to empty them all by drinking before your brew is ready to bottle. Much more fun than making 3 gallons of brew...
Every pirate lives for something different. For some, it's the open sea. For others (the masochists), it's the food. For you, it's definitely the fighting. Two things complete your pirate persona: style and swagger. Maybe a little too much swagger sometimes -- but who really cares? Arr!