Those are not a must. If you think it will bring extra strenght you can do it but Rob Kuiper didn't drilled those holes like he suggested to me. I don't have them and I use the old chassis. The front end really looks superb, easy to work on and easy to setup even the wheelbaseadjustment.
Only one thing occured when I build the upgradekit. When you thighten the screw on the radioplate for the servosaver the saver got stuck. I reassembled the servosaver several times but stil got a problem with it.
It can be smoother but when I thighten the screw it's stuck again.
Wanted to post pictures of it but seemed to have failed
read the following tread