"If the Ethiopians really do have the Ark, would they really need to rebuild the Temple (which would involve knocking down the Dome of the Rock, which would trigger a war) or could they just put the Ark in a tabernacle?"
Last night, Hal spoke of his support for the theory that the temple was to the side of the dome of the rock. It's a theory with widespread support.
As a trivia note, the text on the Dome recognizes the virginity of Mary and that Jesus was the Messiah but disputes the fact that Jesus was the Son of God and also the Trinity.