CONSTRUCTION
A copper automaton is crafted from 250 pounds of copper ore, iron gears, and lead counterweights, and requires a 500 gp gem as the focus for its magical energy source. Assembling the body requires a DC x Craft (metalworking) check.
CL 6th; Craft Construct, grease, caster must be at least 9th level; Price 5,000 gp; Cost 2,250 gp + 20 XP.
Since the standard model requires a DC 15 check, maybe 12 or 13 for the miniatures?