The torso should have 380-400 hp, 120-130 energy cap., 20-40 regen, 120-130 heat cap., and 20-40 cooling. That way almost as good as mythicals. It would have to be at least that strong to be able to stand a chance against mythicals.
As for legs, depends on what you want. Better cannon feet? Give it 60 Damage and 90 hp. Better quake feet? 90 Damage, 20-25 hp. These things have to be that good, or else just get destroyed by mythical items. I made the stats have gaps, since physical would have more hp (400), heat would have more cooling and heat cap (40 cool, 130 heat). Electric, 130 energy cap and 40 regen.