[asid61]

You could extend your chassis front/back to hold bumpers there (by my calculations up to 3" total), and out the sides for the same purpose.
You may have to remove the treads or reduce the size of the front wheel to make that work.
Your intake/corral needs to be able to reach over the bumpers to stay the same width. As the above poster stated, it can't be counted as part of the FP, so maybe leaving it up at the start of the match and lowering it once the bell rings could let it coult as something extending beyond the FP.
The main issue you have is the 8" bumper per side-next-to-corner rule. You could have the corral reach over the bumpers and corral external to the robot (as 8" of bumper per side leaves only 10" for the ball to pass through).