Rashi on Exodus 35:11/רש"י על שמות ל״ה:י״א

1את המשכן THE TABERNACLE — The lower curtains which were visible within the building are called משכן.

2את אהלו ITS TENT — this is the covering of goats’ skins which was made to serve as a roofing.

3ואת מכסהו AND ITS COVERING — the covering of rams’ skins and tachash skins.