I took the liberty to expand those images and approximate the arcs for the Assault frigate and Nebulon. Not completely exact since I used the perspective pictures from the wave 1 blogs to find the position of the yellow dots and arcs. I have also assumed that the VSD and Assault frig has the same base size, ans the same with the Corvette, Nebulon and Gladiator. The Gladiator picture is a a different angle compared to the Corvette/Nebulon so it's a bit more tricky, but from looking at it I think it is very similar to the Nebulon, but the Yellow and Green zones are wider and the Red zones are slimmer.
The blue zones are where you should be to be able to target 3 different zones.
I have made a lot of assumptions so this might be all wrong, but it does demonstrate how much of a difference the placement of the firearcs and yellow dots really are.
Edited by Realmil