Some weight fixes and mesh tweaks to make the Silver, Duke's Guard, and Nordic Iron cuirasses flex at the waist like most cuirasses do, and be a little less of a mess mesh wise (there were some ugly problems.) Note that this makes a solid metal chest-piece bend, but the others in the game already do, so if you have a problem with that you're gonna have to take it up with Bethesda.
The vanilla cuirasses clip very badly while you're running, which was the main reason for this mod in the first place. Note that even with my mod, there are still some minor problems, but don't worry, I tried "fixing" them and the "fix" ended up looking worse than normal, so trust me, this is the pretty much the best I could do.

For installation, drop the "meshes" folder into your Data Files folder.