Think you might have a small problem with those Hayabusa shoulder perms. You haven't removed the basic Mk VI parts from the bicep, meaning they'll be taking up the space where the Hayabusa shoulders should sit. Take a look at the references in the Wiki.
I actually going to mount the busa shoulders to the MKVI shoulder plate, I couldn't think of any other way to mount them without serious modifications, but if you have any ideas Im willing to listen, I belive the shoulder may stick out a little mounted to the MKVI shoulder