this guy started out as basically a normal space marine, with a tech marine backpack.
I then gave him a proper plasma pistol ( from the space marine commander box set) and a cool tech marine shoulder pad (from a land raider set).
next i scratch built three servo arms out of sprue ( for the structure of the arms) and a ton of random bits. the flamer arm end bit is from a dreadnaught box set, the twin linked plasma pistol is a combi-plasma gun (also from the space marine commander box set), and the giant drill is a screw.
all the wires (including the ones on the servo skulls) are made using guitar wire, courtesy of my music teacher.
the servo skulls were added next. the one on your left has an iron halo (from the commander box set again) and the other one is holding the tech marine's axe (no idea where it came from, but its metal, had it forever, and is not GW)

next came all the independant servo skulls. one of them is fighting a nurgling, and another is scanning a tau head. other than that they are just sort of trolling around as servo skulls do.

notice i took the time to drill out all the gun barrels. i tried to prime them but only had the dreggs of one bottle left :/ i think i will just paint over it and hope for the best. i give them a strong sealer-coat.