I did a tour last spring of the plant here in Toledo
Hard, no very hard to get in, have to know the right people.
I know my friend from Spain wanted to tour it, and up until about the last day we still were not sure they would let us. there was a larger group went through a few weeks afterwards I know.
It can be done, but ...don't expect to drive up and say I want to go through the plant today
Leaving the plant and then standing at the end of the line, you were not allowed to take pictures inside but will take yours at the end of the line!