No prob troph! Ya don't have to go too crazy. Just a little bit is all you'll need. When the knuckles turn, they'll hit the pivot or pillow ball (whatever ya call it
) Just machine the slots in there. You'll see what I mean when you look at the knuckles as you move the wheels from lock to lock.
BTW, I think Mugen has upgraded knuckles too though don't they? My ProSpec truggy has mega throw! I think I remember reading something about upgraded knuckles come to think of it. They're already modded for more throw. You really should look into it.
I was just doing the same thing to my XRay which as you may know is a C-Hub buggy. A little more complicated to do on a C-Hub car
Good luck and remember, go a little bit at a time. You can always take more off but ya can't add material back on the knuckle!
regards
speed metal