MegaHawk. SFB Module R7:
An additional 2 SparrowHawk engines were installed onto a Hawk-series hull. This ship is very much like a KillerHawk, except it's heavier. It's a DN, and sports the same plasma complement as a KHK: 1xR, 2xS, 2xF. It has never been built, but the design included many variants, since it's modular.
OmniHawk. SFB Module R7:
1 Additional SparrowHawk engine was installed onto a Hawk-series hull. This ship is considered a "Light DreadNought" and has a lighter movement cost. The PLaR has been replaced by a light PLaS, but like the MGH it's very modular and can sport many different SparrowHawk configurations.
Gorn Fleet Tug. SFB Module "Advanced Missions".
The rear "bubble" is an attachable pod. It can be a cargo pod, commando pod, battle pod, etc.. The pod is detachable, hence the no-pod model.
See what I mean? These things are good enough to be used/released.. but not with Thu11s' permission which he requests when you install his models.