I just notice something and came to a realization about the Mark I Iron Man armor. If you notice in Captain America: The First Avenger, the armored HYDRA trooper has certain parts on it that look like much of what eventually becomes the Mark I armor. I think it is possible that when HYDRA was defeated, that somehow either Stark got his hands on one and keep it as a keepsake and eventually Tony saw it when he was younger. Eventually while in capture, when Yinsen was talking to him after somewhat agreeing to making the Jericho missile for the Ten Rings, while looking into the fire, he thought about the suit and where he got the inspiration to create the Mark I, in effect, creating the Iron Man suit. I don't know. I just said that because I kind of watched both films a while back and kind of take notice of that.