xlr8or,
We have run into about any problem you could imagine. Usually it is just plain sloppy work.
We have seen someone attempt to weld bolts together to make them longer!!!
Can you belive it?
We have seen hoses hanging under the frame, alignments so far off you could see it. Cobbled together brackets are more common that I wish. Mostly it has to do with monkeys using monkey wrenches and not caring much about how anything goes together.
Of course, we have seen some exceptional work done by some of our customers, (Morris Clement, and Tom Decker immediately come to mind--not that there aren't others), who have even helped us to improve what we do here.
Unfortunately, there seems to be much more crappy work than nice work by and large.
David