I'll be brief and get to the good stuff..... I've just finished putting together the prototype for one of my Thousand Marine squad. He's a heavy kit bash and designed to look very much like and automaton.
Bits:
Base - Micro Art Studio, (I forget the name)
Legs - Forgeworld, MkIII Iron Marines
Chest Front - GW, Thousand Son Kit
Chest Back - GW, Grey Knights in Power Armour
Arms - GW, Thousand Son Kit
Shoulder Pads - Forgeworld, MkIII Iron Marines
Head - Max Mini, Mecha Egyptian Heads
Backpack - GW, Chaos Backpack Bits
Gun - GW, Thousand Son Kit
Flame - GW, Burning Chariot