Is anyone else thinking that Ivan Vanko is based off the third Crimson Dynamo, Alex Nevesky? Who in the comics was Anton Vanko's prestige and blamed Iron Man for his mentor's death. Just apparently making him Anton's actual son and changing his name accordingly.
And on the topic of how big the Crimson Dynamo suit should be, I think it should be about the same size as Iron Man. Just bulkier if anything.