You are only proving my point. They can't be built to zero tolerance. Did you read the first word of my post? "IF" Soooo, You cant ship them to a body shop and have everything fit. It needs to be built on the rack otherwise there may be fitment issues because of the tolerances you described. Heaven forbid its a grand-am with pierce and form manufacturing. Anyway we are derailing this thread at this point and yes I have done a bit of collision repair. Been out of it for a few years now. I spent 8 of my 30plus years running 2 car-o-liner racks with car-o-tronics measuring system feeding 8 bodymen in a ICAR Gold certified multi million dollar shop. My last 16 years I was an ASE certified master. I've been fortunate to work for some people that paid for a lot of training for me.