Sorry if this is a dumb question but I’m fixing up my little old sea king aluminum fishing boat. I’m replacing the transom with some fresh new wood and was wondering about a cap. So this boat has never had one that I’m aware of. Anyhow what’s the purpose of it? Is it needed? I can’t see how that thin gauge aluminum people use to make one does anything structural. It looks more like it’s an aesthetic type deal. Does it serve a needed purpose and should I consider making one? Thank you guys.