This hugging the building to the left is correct, and once you have reached the end of the building, you just carry on straight for some 100 yards, and yes, it will magically appear.
I've posted on DD somewhere a pic of the building.
However, I doubt you will get transportation till the fct, and depending on where your plane drops you, you might have a long walk till the place where you exit the terminal.
(The idea of the fct is meant for people making their check-in in FRA, hence its location)