Not necessarily, but add in what you have suggested above therefore includes removing standard upper control arms/bushes, purchasing new aftermarket arms/bushes, installing new aftermarket arms/bushes, get another wheel alignment for new camber settings, and all of a sudden it's getting extensive (and also expensive).
Your missing the point, Willis has specified NO modifications, I'm not disagreeing what your saying won't work, it's just no good for this application....
From my understanding in Willis' posts he's not building a track car.
Make sense??