Soul Grinder
Vents on back from Daemon Prince
Head from Warriors of Chaos Slaughterbrute / Mutalith Vortex Beast
Shoulder Pad and Cannon from 40K Chaos Space Marine Forgefiend/Maulerfiend
Side pistons from Chaos Deamons Skull Cannon
Added some Khorne symbols to the middle and back leg plates
White tubes are plain styrene
Metal tubes are from DragonForge.com a local sculptor
Plus plenty of glorious green stuff
Additional images
Soul Grinder 1Soul Grinder 2Soul Grinder 3Soul Grinder 4