Maokai Build

So instead of starting Rod of Ages you start tear. Then build merc treads, frozen heart, righteous glory, archangels, spirit visage and locket of the iron solari. With the extra mana from archangles, righteous glory and frozen heart, plus your base mana, the passive on archangles gives you about 160ap and an almost 600hp shield on the seraphs active. Is this viable? Would it work? Would Maokai still be extremely tanky or is it better to skip the offensive item completely and build a thornmail or banshees or something?