ARRL did some EMP-like testing and published articles in 1986.

EMP is not lightning, it is somewhat like it but lightning protective devices may not protect against EMP.
Likewise a metal house, unless built to milspecs for EMP may not be so good (though it ought to be better than nothing except that your powerlines, phone cables, and TV cable will carry the pulse into the shielded enclosure - oops.)

I have a CD full of articles about EMP we bought a couple of years ago. (don't know where from - I can't lay my hands on the source disc) Articles are US Govt testimony and studies and even tech manuals on how to build an EMP-safe facility. It might help to have some background in RF or electrical engineering since some if it is pretty deep theory.

I recommend doing some research before deciding everything will be ok.

Remember that soothing words were said about New Orleans' flood preps within the last decade.