Ancient Hawaiians also constructed the largest primitive rock quarry in the world near the summit of Mauna Kea (https://www.nps.gov/places/mauna-kea-adz-quarry.

Ancient Hawaiians also constructed the largest primitive rock quarry in the world near the summit of Mauna Kea (https://www.nps.gov/places/mauna-kea-adz-quarry.htm https://www.nps.gov/places/mauna-kea-adz-quarry.htm), to mine dense rock for stone tools. So it's hard to believe that pre-contact Native Hawaiians believed that the summit of Mauna Kea was too sacred to build near (the TMT would be further below the summit than most of the existing telescopes [only the VLBA antenna would be lower]).