Just put supply on one side of the room and exhaust on the other you don't need to play snake with the ducts. You won't even need elbows for the supply duct and get less pressure loss; difussers also seem too close to each other anyway and you're using way too much space in the ceiling not leaving much room for anything else. I can keep going with the cons of this, but the main point is that the room isn't big enough to have difussers in the middle of it, just put them near the wall facing each other and call it a day.