it depends which armor he is wearing when it comes to strength and durability one feat from three yrs ago or a decade ago cant be used for the current doom..
i heard his base strength was somewhere in the 5 to 10 ton range at one time but it has changed since then... some of his armor has had better durability then other, some are of different material as well..
i guess we need to see what modern dooms durability feats are.