It does appear that this was the problem, I have changed the line
-- USS John C Stennis Model
scene.stennis = sceneAPI:addModel("cvn74", 0, 0, 0); --LHA_stennis
to read
-- USS John C Stennis Model
scene.stennis = sceneAPI:addModel("nimitz_cvn_74", 0, 0, 0); --LHA_stennis
and it now loads and shows the scene however the positions don't look quite right but I will be happy with it until you do an update