Why is the word "Kalos" punctuated with a 'Patach' instead of a 'Sh'va'?
Rashi: It is a hint that on the day that the Mishkan was erected, Yisrael were like a Kalah entering the Chupah. 1
See last Mishnah in Ta'anis.
And why does the Torah add the word "Kalos" in the first place (See Sifsei Chachamim)?
Rashi, Ramban #1 (citing the Sifra) and Targum Yonasan: This teaches us that on each of the Shiv'as Yemei ha'Milu'im, Moshe erected the Mishkan and dismantled it, until the eighth day
Rashi: On te second of Nisan, they burned the Parah Adumah, on the third, the Kohanim sprinkled the ashes on the Levi'im and on the seventh, they shaved.
Bearing in mind that Betzalel, Ohaliav and all the wise men constructed the Mishkan, why does the Pasuk attribute it to Moshe?
Rashi: Because Moshe was Moser Nefesh to see to it that they constructed the Mishkan exactly as Hashem taught him on Har Sinai. 1
Rashi: And he did not make even one mistake. By the same token, the Navi in Melachim,1:16, refers to the Beis-Hamikdash as "the house of David", because he was Moser Nefesh (regarding its planning and the collecting of funds for it)
What is "ve'es ha'Mizbe'ach ve'es Kol Keilav" referring to?
Ramban and Seforno: It is referring to "be'Yom Kalos Moshe", mentioned at the beginning of the Pasuk.
And what is the meaning of "Vayimshachem va'Yekadesh osam"?
Ramban #1 (citing the Ibn Ezra): The Pasuk means that Moshe anointed the Mizbe'ach and its vessels with the anointing oil and sanctified them with the blood of the Chatas. 1
Ramban #2: It means that Moshe anointed them in order to sanctify them.
See the Ramban's objection to this explanation.
Why does the Torah insert this Parshah here and not in Vayikra?
Ramban (citing Seider Olam): 'On the first day of the Milu'im, Hashem called Moshe from the Ohel Mo'ed and told him all the Parshiyos from the beginning of Vayikra until "Vay'hi ba'Yom ha'Shemini"