Shalom Chaim,
My comment concerns your representation of 'Chassidic' ideas concerning the Beit HaMikdash...
Chabad does not teach that it will fall from heaven. I have discussed this with two Chabad rabbis and both have said just as you have said. Also the Chabad website says virtually exactly what you said. As a matter of fact, this last weeks Parsha Pikudei had the story of the setting up of the Mishkan by Moshe. He had to make the effort to erect it, and a miracle happened, and Hashem helped him set it up...
Also Chabad shares your view on Eretz Yisroel and the modern state.
I spoke with a friend in my minyan for almost an hour about Rabbi Kahane last Shabbat... My Rabbi had only good words for HaRav Zt'l...