Mech Stuffs?

Currently working on a project that is outside of my comfort zone. I've decided to take on this project to gauge my skills and time management.

This building concept is from the game Dominator: Hundreds of Sparrows.

This is my block out I have done so far. I'm having a hard time dissecting the back area of the building as well as the protruding object. There are still some adjustments to be made, but my goal is to roughly have this blocked out by tomorrow.