You realize, of course, that with less than 150 armor and under 70 magic resist, Warmog's Armor is nearly useless in terms of effective health? In order for Warmog's to become any more cost effective than the armor or magic resist items in the game, you need at least 200 in both stats. Without it, your health drops extremely quickly. Armor and magic resist also indirectly make his ultimate much stronger.

Although flat health may improve your Vicious Strikes, it's not enough to keep you alive in a fight. Banshee's Veil is very important, not limited for only when they have 3 champs on their team that do CC. Your "optional items" include items that need to be in your main build. Warmog's stacking is a terrible idea on almost every champion in the game. He really only needs one to function effectively, and before then, you HAVE to prioritize armor/MR.