Okay, Tungsten is 2.48774194x denser than steel, so you get an EC that weighs 1192431.11 tonnes.
Using your cylinder proposition that'd make EC...
4793929.94 tonnes (making him heavier than the giant Metal Knight robot that Tank Top Master stopped)
Also, looking at the Metal Knight page in Spanish, it seems the translations are more or less correct.
-Metal Knight's robots are made of the same special material as the original Hero HQ.
-No one gets to the scene faster than him!!
Those are the only things I saw worth pointing out in there.