Also the third beis Hamikdash is gonna look different than the other two and we need moshiach to tell us how to build it as it’s unclear how to build it from the actual nevuah.
Also there’s four opinions who needs to build it and what that entails:
1) Hashem
2) Moshiach
3) bnei Yisrael
4) just put on the doors
There’s a sicha on all the opinions and how we can be mekayem all, just haven’t learned it in awhile.