Bodykits + Durability = Never going to happen
It doesnt matter what its made out of, if you have a kit, it's a must to lower it down closer to the ground.
I currently have my OEM lip on my S14, and i still scrap it. I had a accord with R34 front bumper and i repaired and paint it up every month or so. I was very careful when driving, but sometimes shit happens.
The fact that your friend owns a junkyard will help out, but still, I have very little faith that your friend can supply you one. If your friend does get you one,

Why not go with a S15 front clip conversion than a S14 kouki???