Oh boy John, are you in for it!
The problem isn't the so much the routing and increased cost (up to 1000% $ increase) of the AFCIs as compared to a standard breaker, it's also the 10%-20% failure rate of the AFCI breakers within the first year. On this same project, with 4-5 AFCIs on each of the 3 houses, I've already had to replace one of the originally installed AFCI breakers, and the meters went in a week ago!
Hopefully, the manufacturers will start to concentrate on improving the reliability of their products now that they've spent so much of their time and resources pushing through the code changes.
Good luck!
