Just move around the plane when in the air!!!
Press "S" until you are in "Spot" view!!!
Then you can move the "camera"in a way that you can take shots of the belly....
I think you can also alter the position of the tower....you can put where you want on the map, also being able to assign it to any altitude you want....!!
Gee..I hope I didn't misinterpred your post and told you things you already know!!!
"That's the good thing about the 707...it can do anything, but read!" Joe Patroni, Airport '70