Bs”d
38:22–the begiining of Pekudei Rashi brings that although Moshe’s instructions to Betzalel to first construct the vessels, Betzalel understood on his own that it was correct to first construct the Mishkan and afterwards the vessels; the minhag haolam is that first we build the house and then the contents. Although from a practical standpoint it was irrelevant in this case, but following the mihag haolam takes first priority. It is the great foundation of derech eretz. This is the idealism of how Hashem wants us to structure every aspect of our lives, even how to build a Mishkan.
Have a wonderful Shabbos and a month of redemption.