Why a Temple? Why spend all of this time and resources building a Temple for the Jewish people in the desert? How did this solve anything?
Before I answer, it's funny how the stories and traditions in Judaism that seem the most arcane and Achaic are the ones most relevant to life today. The Torah details the specific measurements of the Mishkan multiple times; you might think it's overkill; after all, this is a spiritual home for Hashem. Who cares if the vessels and tapestries are an inch bigger or smaller? It's the thought that counts. However, a deeper understanding of the Mishkan's purpose clarifies its specificity. The Tabernacle represented the ultimate fusion of the physical and spiritual here in our world. This being the mission of the Jewish people, we needed to see this space as an example of the integration work to bring the entire world.
That is why the Temple needed to be exact in its measurements, design, and construction. It showed the Jewish people and the rest of the world that the physical could be made holy, but only if we follow G-d's instructions exactly as the torah tells us. When we do, we see gold, silver, wool, cotton, animals, and humans elevated to a higher plane. There, every creation is precious and every moment is an opportunity to advance our world closer to its ultimate perfection, an era of peace and harmony with the coming of Moshiach, speedily, amen!
Mission:Be precise in your Jewish life, if you want to elevate your world. Remember, the divine lies in the details.