You are right. I have paid my attention to the painting detail going through the couple of B&W films for the Raiden. A couple of them had a, quite narrow, light band ( IMHO of the yellow ) on the fuselage in front of the tail. But none of them had the yellow fin tip. Also, most of them had the gun type 99-2 mounted as the inner one. But it looks like the armament could be as either outer or inner gun installed.