As penance, Herod rebuilt and remodeled the second Beis Hamikdash (See Bava Basra 4a). Most of the models of the Beis Hamikdash are of this rebuilding.
What did the original one look like?
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The original one was built by the poor immigrants from Bavel, and it had wood in a one to three ratio per the orders of Darius. He decreed this so that if the need arose he'd be able to burn it down.