My proficiency in levelling shots has improved over the past year. Every now and then a difficult and very subjective level situation appears. The shot below was rejected for level. I thought it felt right after I levelled it, and the PS grid lines aligned with the vertical lines on the walls of the multi layered/storied hanger at the center of the shot. The horizon cannot be judged from the tree line as evidenced by the C-130 which is in a lower area. The angle of the SNJ-2 Texan has not helped matters. McGuire Air Force base appears flat but is actually undulating with small rises and shallow depressions.The only reasonably flat areas are the runways. Your help as to the best way to level this shot will be appreciated.