Hi Ant,
I was doing a machanicum army but difficulty in getting parts and not a large drive to do it stoped me.
Well to start i have the following resorces;
tempest army list for mechanicum army,
Shoulder pads from s/m from the vehicle boxs, everyone doing loyal marines will have one of these with each vehicle,
Techmarines,
Tech preists from imperial guard,
Servitors,
and a shed load of servo skulls and mechanicum insignir from my warhound!
Let me know if this is of any interest.
Lee