1)
What place did he prepare?
1.
Vilna Gaon, Malbim: It was a stone building.
2)
What tent did he stretch?
1.
Vilna Gaon, Malbim: There were curtains above. Until now it went in an Ohel and Mishkan (Yehoshua 18:1, Shmuel II, 7:6).
