Why Iron ?

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The First and Second Temple were destroyed by means of Iron, which is why it is excluded (among the building tools) from the Temple.But this does not apply to the Temple of the Future, Eternal and free from destruction.This excludes any fear of an employment of Iron which is the opposite of the sainted, because in the Times to come, the very existence of the Iron on the other side will have been canceled.

Therefore, its construction can, and should, resort to iron, this in order to emphasize the superiority and perfection of the transformation of this Iron, means of destruction of the Sanctuary, by means of construction of the Sanctuary.

Speech Of  The Lubavitcher Rebbe,Rebbe Menachem Mendel Schneerson ,Shabbat Vayehi 5752.

Iron symbolizes what is right and does not bend. G-d warned the people in this way that if his stubbornness continued so inflexibly, he would cause his own loss.

As a result, G-d explained to the children of Israel how to prevent the destruction of the Temple, using a possitive Iron.This symbol corresponds to the refusal of any compromise, in the fields which concern the Essence of each.The Essence of the soul is the source of a deep force that never bows to external pressures.

The Moshiach will come thanks to the revelation of this will of possitive Iron.  

Speech Of  The Lubavitcher Rebbe,Rebbe Menachem Mendel Schneerson,10 Tevet 5752