Inspired by PDHs awesome slaaneshii slaughterpriest conversion (which can be viewed here: http://www.dakkadakka.com/gallery/757625-size%20comparison%20.html) and set on creating a different looking Dark Mechanicus Techpriest I started splicing the two kits together.
Here's an early bluetacked sketch:
There'll be loads more stuff added of course - vestigal arms, mechadentrites, greenstuff cowl, lots and lots of wires among other things. Obviously a muscular techpriest, however chaotic, sort of goes against the archetype, but that's sort of the point - the idea being that he's mutated and enhanched his own body using arcane technomantic genecraft.
I'm rather impressed by the slaughterpriest - it's the first AoS miniature I've bought. A beautifully sculpted kit, cleverly cast and surprisingly easy to put together.
And boy if he isn't big! Here you see him next to a human sized plague cultist: