Regarding the shoulders, I'm going to throw in just a picture of a lion to demonstrate what I mean about it being too broad: essayspeechwala.com/wp-content…
Obviously, I want the shoulders to stick out a little bit, but more like...legs being built on an otherwise sleek body.
Example: zoidswiki.ligersunion.com/imag…
For the cannons, I want something more shaped like this: www.themarmot.net/wp-content/u…
Fairly wide for it's length. As for where they sit, I've done a *really* shitty paint job to just highlight the general area. The circle being where I want the back and where it'd meld into the body of the mech, the rectangle demonstrating how it sits on the shoulder and roughly where it ends.
i.imgur.com/PP0tT1u.jpg
I think that'll cover everything. Sorry for not getting good references earlier!