I'd just add in the vertical loops needed to get rid of the n-gons around the windows. Some of those loops it might have been quicker just to select and add a bevel (smaller distance, possibly doing one level of rounding for any edges that actually define an edge)
But should I make the edges go through the entire mesh (like a loop) or is it ok if I only select the window edges and bevel them? That would create triangles and I heard they're bad for sub-d. On the other hand, if I make the the edges go through the entire mesh, I mess up the entrance tunnel part. EDIT: This is what I…