besides the first few lvls, heimdinger doesn't really have mana problems the turrents give such easy farm that the doran's ring tends to be enough. Therefore no need for the chalice of harmony, just get some mana potions. lich-bane is also a really bad item, you don't really auto-attack so Its passive becomes useless. Iceborn Gauntlet, you have no AD so half of Its passive is useless off the bat, Rylai's is way more useful for slowing enemies (with your turrents). The spellblade passive is not really ment for heimdinger.

uhhh. i would go to this forum and ask for help.

Here, have a -1. The guide is really, really bad. No other way to say that.

The info below the build needs some work; capital letters, spaces after [ [images] ]. Quite a nice build, I say, maybe the mr, ap, cdr etc list doesn't need to be there; there are fully comprehensive build for that; people viewing this build want short and to the point, just like with mine.
Have a good one