At this point, we're a little bit too far along to go back and fix everything. Remember, it's a video game. Play it because its fun. If a boat took up the entire screen, it might not be worth having because it could get in the way of playing the game or in some cases be unable to move. If you were to have a dock in a small lake and build a massive boat in the way, you could be obstructing fishing routes and have no way of disposing or moving this monstrous creation. You might also notice that the buildings aren't perfectly to scale with our units. For the same reason, our buildings are a little bit smaller so that you can build an adequate city in a small area. As for the unit's heads, I appreciate your input but they are correctly scaled in my mind. Look at this unit showcase image of the Persian Immortal. The heads are in proportion, and you can compare it to just about any image of a human being. Except for those with freakishly large or small heads.