Interesting, never saw that detail, that is making the Apollo Bomber variant more of an early Hercules it seems!
Ok: new plan then, let's have:
A early Apollo variant, like the one in the Alpha: 2 Missile pods in the center, 2*2 Guns wide
The normal Apollo we all know: 2 Missile pods wide, 2*2 Guns in the center
The Bomber variant: 2 missile pods in the center, 2*3 guns wide, turret/extra gun under the nose
Maybe i am also doing an MK2 variant, hmmm..