Probably volenteer helpers----no one would tell the builder of a car that they didn't like something---

Also--as the race goes on---its get it to the staging area/starting line--maybe the other guy will light the red blub and other guy gets a free round---but if that doesn't happen, its a all out run

front of car---body isn't off of car at races and doesn't get looked at--even between meets/maybe seasons

If you have a chassis by one of the certified builders---I guarantee that as they walk around the pits/lanes, they look over cars to see how they're doing---even the competion