Thx. You made my point for me. Most everything I ever built in the field had to be reengineered in the field because the engineer that drew it was working (in his mind) from a perfect world just as we see in this very forum.
the products i design have to be assembled in the field....and we get complaints about "this don't fit"...and they didn't follow the installation instructions and couldn't get the particular parts properly assembled.....
speaking for the engineering group i work in, believe me, we do plenty of calculations to ensure it fitting as long as it's built in tolerance according to the print. we work on a 3d modeling system that tells us when there are conflicts. our calculations indicate if something will fail in the field - and we have to have those for the inspectors.
when things don't fit properly in the field, it is a conglomeration of problems that drive the results - where it's going in, if the part was properly manufactured, if the part was inspected (many aren't), if the field measurements were correct to begin with (which drives which size you order....etc) and if the correct procedure was followed in the installation.
it's not always the engineers.
and just because we're a bunch of socially inept geeks doesn't mean we don't know what we're doing.
unless they're french.