The halved weight appeals.
Blending the iron golem's construction mechanics with the flesh golem's DCs and pricing yields...
Construction
A spiked golem’s body is sculpted from 2,500 pounds of assorted metals, smelted with rare tinctures and admixtures costing at least 500 gp. Assembling the body requires a DC 13 Craft (armorsmithing) check or a DC 13 Craft (weaponsmithing) check.
CL 8th; Craft Construct, geas/quest, keen edge, limited wish, caster must be at least 8th level; Price 20,000 gp; Cost 10,500 gp + 780 XP.
Does that work?