First off metal thickness only changes the I. D. not the O. D.
Second how much off is just a little on the bubble.
A little is a lot over a long length.
Absolutely, just a lil off center could be 1/8" per foot. That's an inch in 8'. I'm really crazed w/ a bubble. I use American made levels that are guaranteed to be -/+ .0005 per foot. But I prefer a laser for alot of thing's
