How's this? I added cat's grace to the mix to account for the clockwork balance.
CONSTRUCTION
A copper automaton is crafted from 500 pounds of magma, copper ore, iron gears, and lead counterweights, and requires a 1,000 gp diamond as the focus for its magical heat channels. In addition, the blood of a salamander or fire snake is needed to provide the magical heat. The costs of these ingredients can vary widely, assuming they can even be found. Assembling the body requires a DC 15 Craft (metalworking?) check.
CL 9th; Craft Construct, cat's grace, grease, heat metal, caster must be at least 9th level; Price 10,000 gp; Cost 4,500 gp + 400 XP.