the plan is to hold up with your turrets & rake in the gold, you can get most of the item easy as you progress.
after of have the item outlined, get boots or more magic items so u can total about 540-600 ability points by end game.
you do 600 + with your CH-1 Concussion Grenade,
about 500-600 with Hextech Micro-Rockets
your turrets will be doing 150-200 dmg a shot.
all item after the archangel staff can be changed.
ps: (I will be editing it to have the skills perfect)