Since some people on other forums voiced concerns about anatomy.
I use a standard GW "10-head(Heroic)" anatomy. That is, normal humans are roughly eight heads tall, to make it more heroic, painters usually make the humans nine heads tall, GW (and me) make the spacemarines ten heads tall.
As you can see, this image shows the anatomy of the Sar in red, and next to it you can see nine head-circles on top of eachother (one is below the image, cropped out if you will). The only thing that looks odd about the image, anatomy-wise is the leg-armour, because it is bent differently then how the leg would go, and then only by a minute difference. These are things that I fix as I go.
With Sosol, the terminator, there is a similar thing going on, though the terminator armour was never anatomically correct. The arms just wont fit. Therefore I favour a point of view where the ams of a terminator armour is part mechanical (like in the teaser-trailer from Starcraft2) and that the legs have the actual feet of the SM before the foot of the armour begins.
Hopefully this helps a little.