1)
What is the significance of the double expression " ... Kol Ish asher Nesa'o Libo ve'Chol asher Nadvah Rucho oso"?
1.
Ramban: "Nesa'o Libo" refers to those who suddenly discovered that they were capable of doing the necessary work for the Mishkan, even though they had never learned it, and who felt a sudden urge to volunteer, whereas "Nadvah Rucho Oso" refers to those who donated towards it. 1
2)
What is the difference between "Meleches Ohel Mo'ed" and "Kol Avodaso"?
1.
Rashbam: "Meleches Ohel Mo'ed" refers to the curtains that covered the Mishkan and the Paroches, and "Kol Avodaso", to the curtains that surrounded the Chatzer and the holy vessels.