IRS... just a few questions to clear up.

After some thinking, I decided to do IRS over the panhard bar and torque arm, but I need some final questions answered:
1: Axle width. How wide will the tires be pushed out? Passed the fenders? Barely noticeable?
2: E-brake cables. Can the stock fox ebrake cables be used? No, correct?
3: Which springs fit? Should I just use the stock IRS ones? What about shocks? When I go shock/spring shopping in the future should I look for Fox parts, or IRS specific stuff?