Advice on modeling the Impulse Gundam

I’ve been trying to model the Impulse Gundam, but I’ve been having some trouble trying to figure out how best to model the chest section and head. I’ve tried blocking it out, and extruding some parts, but just can’t seem to get it to work right. Any advice on how to block out the basic shape?

There’s nothing basic about this guy. You will need a wide range of modelling techniques to accomplish it. If parts are too complicated, you can try to build it in pieces and then use the retopo tools to construct a mesh over top of those pieces.

Hint: lots of floating, overlapping pieces. Don’t try to extrude all of that out of a manifold box. You wouldn’t make the robot out of one piece of metal, don’t make the mesh that way either.

Here’s what I have so far.

My main problem is that I can’t seem to get the upper chest right. I think all the sloping angles are the problem and I can’t seem to get them right.