He'll still go down from stun damage fast enough . .
Pain editor will help.
Manabolt will do the job very quickly though (as will a large number of willpower resisted spells).
I have a troll at 27/23 with SWAT armor, FFBA, PPP, Ortho and natural, plus body for damage resists (no armored cyberlimbs). He's far from maxxed, and no pain editor, but he does alright.
Don't dump-stat willpower, get a counter-spelling mage buddy, and remember armor modifications - particularly chemical, fire, and non-conductivity.