I never played GC but the 1st batch of maps , at present , wont include an all interior SD map. The maps are , at present.... Endor (ground) , Battle over Endor ( Space) , Hoth and Mos Espa.
The space map will , of course , have an interior which you can board.
"Government is the great fiction, through which everybody endeavours to live at the expense of everybody else."
Frédéric Bastiat