[Celts] How to be aggressive while Fast Castling?

Hey all.

Thanks to you, I've gotten much better at doing Fast Castle, and now build orders make more sense to me in regards to following the steps of the build order.

I've been practicing with the Celts only so far, which produce Wood 15% faster than usual. With that in mind, I'd like to be more aggressive in my approach, because I'm confident I can make 2 Archer Ranges or 1 Stable + upgrades to harass the enemy villagers while having a decent Castle Age time.

How would you go about it? I dislike the idea of being passive until 17 mins into the match, and if the enemy AI decides to attack me early, I'm screwed because I don't have any military units.

I'm currently playing against the Hard bot, which is still fairly comfortable for me.

Ty!