You can get away with one turn of economy against aggressive openings. Just be prepared to play armor and other ways of mitigating damage if your opponent is rushing you. Admittedly Construction Yard -> Barracks is weaker against aggression than Barracks -> Garrison Post, but you should be fine. If you want to go with the Construction Yard opening, consider Wall of Earth. It's cheap, it can delay an aggressive mage, and if they destroy it, you get mana back.
Either build your lategame options around Altar of Carnage or Altar of Domination, but not both. You can't afford both, and they will push you in slightly different directions. With Altar of Carnage, you tend to want more smaller creatures, a Battle Forge, and Gurmash. The small creatures are much more efficient for generating mana with Altar of Carnage, and you want multiple cards that can benefit from Altar of Carnage in case your Barracks gets torched.