With about 80% of all furnishings and artifacts completed its a rather serious National effort.
80% would be pure bunk.
Any idea how many priests and levites would be necessary, all with ritual cleansing and clothing needs? Mountains of wood. Silos of incense. Stockyards and veterinarians. Plumbing facilities for a slaughterhouse. A chamber of stone for judges. A civil war with secular Jews. Agreement among rabbinic authorities.
Manufacturing museum-quality pieces for tourists and fund-raising isn’t the real deal.
There’s a reason why the messiah is necessary for the rebuilt Temple.