41.65.
Singleplayer.
N/A.
No.
The base I built is considered indoors as I can put curtains on windows. and as far as know, to place a curtain on a window, you need to be indoors. But the panic moodle due to the agoraphobic trait won't go away when inside. It goes away inside the pre-built structures of the map.
The base has roof, and is fully closed. Even the stairs are walled off with a door.