They look at it... they will also ask you what you
used for material.. they do ask questions... like
what is it being certed to.. if you say 7.50 and it
only checks out to 8.50 you FAIL.. even for the 8.50
till you pay again and say 8.50... the guy that certed
my chassis was nice to me.. mine use to cert to 7.50
BUT they made a rule change that I didnt know about..
he asked what it was gonna cert for... I said 7.50 just
like it already had certed to... he did a quick look and
asked me.... are you sure.. I said it certed to 7.50 already
but he told me about the change and explained that if I said
7.50 it was gonna fail and that I would have to pay again and
I would pass at 8.50.. I just told him 8.50 and thats what it
certs to now... I didnt add the braces on the braces to the haylo
for the 7.50 cert... they will take a few thickness
reading to verify what it is
EDIT
Also if the chassis is painted they will scrape a
few spots to check the material and thickness...
this is the way I took my chassis to them for cert