What are the implications of "Pikudei ha'Mishkan"?
Rashi and Rashbam: This Parshah discusses the amounts of gold, silver and copper that the people donated (and enumerates all the Keilim of the Mishkan [Rashi]).
Ramban #1 (citing many commentaries): The Pasuk is telling us that the entire Mishkan and all its Keilim, 1 discussed in Ki Sissa, were placed in the charge of the Levi'im, under the jurisdiction of Isamar. 2
Ramban #2: It refers to the Parshah that follows - to the amounts of gold, silver and copper that the people donated and what they were all used for. 3
Not including the K'lei Kodesh (the Aron, the Shulchan ... ) which were under the jurisdiction of Elazar (Ramban).
See Ramban's objection to this explanation.
See Sifsei Chachamim.
Why does the Torah repeat the word "Mishkan"?
Rashi: Bearing in mind the shared root of the words 'Mishkan' and 'Mashkon' (collateral), the Pasuk is hinting at the two times that the Beis-ha'Mikdash 1 was taken as collateral (destroyed) due to Yisrael's sins. 2
Which is also called 'Mishkan'.
R. Bechayei: The Gematriya of "ha'Mishkan" (plus the five letters) equals 420 - the years that the second Beis-ha'Mikdash stood; "Mishkan", 410, - the years of the first Beis-ha'Mikdash, and "ha'Eidus" - 479, - the era of the Mishkan (which was never destroyed. See also Ba'al ha'Turim.
Why is the Mishkan called "Mishkan ha'Eidus"?
Rashi: Because it served as testimony that Hashem had forgiven Yisrael on the sin of the Golden Calf.
Ramban and Seforno: Because it contained the Luchos ha'Eidus. 1
Shemos Rabah (51:6): It was testimony for Moshe. Scoffers were saying that Moshe kept some of the donations for the Mishkan. Moshe gave a calculation for the silver collected for the Mishkan, Initially he forgot about the 1775 Shekalim above what was needed for the sockets; Hashem helped him to remember that they were for the clasps. 2
"Mishkan" S'tam refers to the bottom set of curtains, as we learned in Terumah (Ramban).
Hadar Zekenim: Moshe's calculation fell 15 (Rosh - 15,000) Shekalim short. Moshe wanted the Mishkan to be testimony for him; they calculated again and found the extra 15 Shekalim (the Gematriya of the initials of "veha'Melachah Haysah Dayam" - 36:7). Moshe said the 15 praises to Hashem in Yishtabach - "Shir u'Shvachah
Seeing as it was the Kohanim who served in the Mishkan, why does the Torah write "Avodas ha'Levi''im"?
Rashi: The Levi'im were charged to carry, to take down and erect the Mishkan during their years in the desert. 1
As the Torah will explain in the first chapter in Naso (Rashi).
What was Isamar's official position?
Rashi, Targum Onkelos and Targum Yonasan: He was in charge of instructing each Beis Av their respective tasks for the day. 1
Ayeles ha'Shachar: Also the Leviyim were divided into six Batei Avos, each of which served one weekday.
Why does the Torah make a point of listing all the details regarding the Mishkan?
Seforno: It is listing the four merits of the Mishkan, on account of which the Shechinah rested in it and on account of which, not only was it never destroyed or captured, but it never even required repairs: (a) It housed the Luchos; 1 (b) It was commandeered by Moshe; (c) The Levi'im, led by Isamar, served in it; (d) It was built by Betzalel and his team of Tzadikim. 2
As opposed to the first Beis-ha'Mikdash, in which the Shechinah rested, but which initially required repairs and which was ultimately destroyed - because the workers were from Tzor; whereas the second Beis-ha'Mikdash did not even enjoy the resting of the Shechinah, since it did not contain the Luchos, was commandeered by Koresh, the B'nei Levi did not serve in it (as testified by Ezra in his Sefer, Ezra 8:15), and whose builders included workers from Tzidon and Tzor (as the Pasuk writes there, Ezra 3:7 [Sefono]).
Why does the Torah not discuss the charge of Elazar?
Ramban: Because Elazar was in charge of the traveling arrangements (regarding taking down the Mishkan, transporting it and erecting it when they encamped), and the Torah is not concerned with that aspect of the Avodas ha'Levi'im here. 1 . Hadar Zekenim: Elazar was appointed over Bnei Kehas 2 , and Itamar was appointed over Bnei Gershon and Bnei Merari (Bamidbar 4:28,33); most of the Avodah was through Bnei Gershon and Bnei Merari.
Moshe was in charge of everything. Why did he appoint Itamar?
Da'as Zekenim, Rosh, Hadar Zekenim citing a Midrash: Authority over the Tzibur requires at least two people.