It is not true that everyone inside the hut will be electrocuted if lightning strikes. There is nothing intrinsically wrong with a metal roof, and the one on the hut was grounded sometime after the 1990 death.
The subject has been discussed here recently:
http://www.whitneyportalstore.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=002102
In that thread, Bob R reminded us of an earlier, more thorough discussion here:
http://www.whitneyportalstore.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=000974