As someone who mained this for over a year with MW stones, it is certainly viable. 
Just remember: You are a
 Melee character that CAN throw at people, not a thrower who can melee. I say this so that you NEVER EVER get caught in melee-range while holding your throwing weapon. If that happens you WILL die. 
Also, I suggest using something other than stones unless you have MW ones. They don't do very much damage, but are fun to throw.
Level 30 (4 420 577 xp)
    Strength: 18
    Agility: 21
    Hit points: 53
    Skills to attributes: 8
    Ironflesh: 0
    Power Strike: 6
    Shield: 0
    Athletics: 7
    Riding: 0
    Horse Archery: 0
    Power Draw: 0
    Power Throw: 6
    Weapon Master: 4
    One Handed: 1
    Two Handed: 95
    Polearm: 1
    Archery: 1
    Crossbow: 1
    Throwing: 115
note: at level 31 you get 7 WM to up Throwing and melee wpf.
can be 1h or pole proficiency as well.
I suggest the Fighting axe or Langes Messer  in 2h mode.