Open your eyes mate, the Cain's red triangle has never been its beam cannon, the underside turret is.
Actually According to

, when FS1 was in development a Triangle of 3 red lights were going to be beam cannon placements (or at least beams for the lucifer and gunports for the others)
so likely it would have been
Cain/Lilith - 4 (1 Primary on the Nose, small ones on the arms)
Demon - 1 or 2 [that ive been able to spot] (Also on the nose)
Lucifer - 3 (2 Ship killers on the arms and the planetary bombarment beam on the nose)
Now obviously this got changed in development but...it would be interesting to see modelled...
But back on topic - I hope to play against this soon