There's evidence to show Moses pbuh was in Saudi Arabia, we know his Father in Law, Jethro was the high priest of Midian, (Saudi Arabia).
We know Moses pbuh fled Egypt with Pharaoh in pursuit with Hundreds of Thousands of people. Did he head towards Midean where he had lived with Jethro for 40 years?
On the cornerstone:
It sure sounds like a physical Temple with a special cornerstone:
Isaiah 28
28:16 So this is what the Sovereign Lord says:“See, I lay a stone in Zion, a tested stone, a precious cornerstone for a sure foundation;
the one who relies on it will never be stricken with panic. <<<<It's a physical sanctuary were people feel safe.