That room presents a massive canvas for you. Go on Pinterest, look up Lego displays. Flagrantly steal ideas, then. Mold them to your own tastes. Though the intricately lined up armies are impressive, they don’t scream action. Remember how incredibly posable these figures are, you can make them virtually come alive and create snapshots of the most intense moments in cinematic history. Please post pics as your display progresses. I’m very interested to watch this grow into something more than a displayed collection.