Hi, I have this side profile of the equilibrium gun and i'm a little stuck as in how i start modelling this. I want to the basic shape outlined first then add in the details. If someone could please point in the right direction i'd appreciate it a lot. I'm not sure if i should use a cilinder or a cube, i've tried this a couple of times but i can't get it to look right.

(you have to scroll down a little)

equilibrium gun