I spent a few mintues perusing the Reaper and Wyrd Miniatures online shops, and found the following items which I thought might be of interest. Many of them are suitable for multiple scales as automatons.
Reaper: Dr. Darius Hellstromme, 59003
Reaper: Mad Scientist, 59014
Reaper: Mad Scientist (Female), 59009
Reaper: Xiufang, 50260
Interesting as an Automaton bodyguard, perhaps - the large shield used to protect the patron more than the construct.
Arcanist Faction: Soul Miner
I see this being used for a 6mm large tunneler vehicle.
Arcanist Faction: Large Steampunk Arachnid
Not my favorite steam spider. But big.
This fellow could be a major hero for an automaton force. I like others better, but it is certainly a striking mini that would be a centerpiece figure.
An alternate to the original steam arachnid swarm. Personally, I think these are too sleek, more sci-fi than steampunk. But still a nice figure.