12PS 11IF go nuts.
Great Maul is best used when you have a bunch of people near you, though you can manage on 1VS1 if you really know what you are doing. Even with 0ATHL you should still be able to stick near a clump of friendlies if you watch what you are doing and don't wear super heavy armour. Siege will be stupid powerful with that build.
If you don't want to be left behind too much on Battle, you could tone down to 30/9 to get the extra ATHL if you absolutely want it.
Seriously though, Pike, Great Maul, 36/3.