1)
Did all the heads of the Avos volunteer?
1.
Ibn Ezra: No - "me'Roshei" (some of them 1 ).
1
In Nechemyah 7:70, it says "u'Miktzas". (PF)
2)
What were the Nedavos?
1.
Rashi: They were for Binyan ha'Bayis.
3)
What is "Al Mechono"?
1.
Ibn Ezra: On the foundation that was from the beginning of the building.
