Top one is what she looks like will all cargo pods, middle one is to show what she looks like under the pods, and the bottom one is all our favorite DY-100, the Botany Bay.
Btw, the reason that the body goes really thin near the rear of where the pods are is so that crew members can open a hatch located on the thinner part and get into the cargo pod's secondary access port in case of emergency.
heh, ya that'd be awesome