Since I haven't seen many structure builds, here is my contribution. I killed king by stacking the shivs up to 80 or so damage and stalling with haste. (Yes of course the shield had haste.)
A little thing you may have noticed that far too few people know, is that a float object can hold up a heavy object and a heavy object can hold down a float object. Consider a balloon for your next earthblade(runeblade?) I don't remember what it's called but it does more damage depending on how much space there is below it, maxing at 17. So you can just hold it up with a bubble or balloon. Just make sure the sword is already supported on the top in some way so it can get up there and once your balloon/bubble is in place, feel free to remove other support!