One is prohibited from building a house in the form of the Beis Hamikdosh. One cannot make a courtyard similar to the courtyard of the Beis Hamikdosh. One is forbidden from creating a menorah corresponding to the menorah in the Beis Hamikdosh. He is not allowed to make a menorah that has seven stems even if he constructs it from other metals. Rabbi Yosi maintains that one may not make a menorah out of wood either.
The sefer Shoel U’meishiv wants to answer the famous Beis Yosef’s question with this halacha. The Beis Yosef asks why do we eight days of Chanukah when the miracle was only for seven days? There was enough oil found for one complete day. He answers that it is forbidden to make a menorah with seven stems. This is forbidden even if it is not in the precise dimensions of the menorah in the Beis Hamikdash. Chanukah could not be seven days since the menorah couldn’t have seven stems.