Quest is easy as hell, did it in 3 hours first time I did it and 2.5 hours second time I did it. The boss fights at the end are also effortless, since you can use protect prayers to make it so you take next to no damage.
No point making a pure for Mage Boxing, since everyone will assume you are 99 Magic/Def/HP Mage Boxing anyways. Same with Range Boxing.
The general opinion seems to be that Ancients would be better to Mage Box with, since you can use Blood Barrage to heal yourself and Shadow Barrage would poison the other person.
The healing from Blood Barrage would negate any extra accuracy Storm of Armadyl has, I would think.