The champion's body was another from the Forge World Plague Marine upgrade set.
Next up, a squad member with melta gun. This was also the first model I tried the rust effect on.
And finally, a shot of the whole squad. The only things left to finish are the bases. For these, I want to go for a red 'mars' effect. Any suggestions would be welcomed! An attempt at this can be seen on part of the champion's base, but I'm not sure whether I like how it turned out.