According to a post above, the melech hamashiach will build the beis hamikdash.
Yehuda v’od l’kra? Who cares what “a post” says? The Rambam says it!
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I think what the OP is asking is:
If it were possible to build the beis hamikdash today, and I take the initiative to go do it, would that make me mashiach?
I don’t think that’s what the OP is asking.