Part two: The torso
The torso is pretty much unchanged in any way the trick is attaching it to the CW legs.
Been a while since I made any of these (got enough parts for thirty or so of them sat around in my bits box...) but the trick is to cut the belt of the CW roughly in two and sit the torso on top. This may mean cutting a nick out of the belt so that it's sits neatly on top.
For the back of the torso I just filled the gap with GS.
I then made a rectangular piece using GS to shape out the back more.
I'll try and get a proper tutorial up asap (including how to make the greeves) but this should keep you ticking over for now. Trick to getting the greeves smooth is to use water, not loads but a thin film on the tool to allow you smooth the surface.
You have to be pretty dedicated to make an entire army of these guys but it's pretty easy to knock up a kill team.