Its really easy .. 16 15 12 8 8 17, level in strength, take twf feats, ic pierce, toughness, power attack and extend .. and you're set.
If you wanted you could drop 1 str point and get 1 more cha to not need a +3 tome for dm4 .. however, it costs you a str bracket with a +3 str tome, so its a better long-term stat allocation to do it with 16 17