1)
What is the significance of a human face and a lion's face?
1.
Malbim: On the Merkavah, the human face was [in front], and the lion's face was on the right. They were carved into the wall opposite the date tree, which hints to the middle.
2)
How did the faces face the date trees?
1.
Refer to 41:18:2:1.
3)
What is "Kol ha'Bayis"?
1.
Rashi: The Kodesh ha'Kodoshim.
2.
Malbim: The entire Heichal.