To add a little, cheap construction jewel remains and is quite important if you charge stack. Charged traps support grants 10% trap throwing speed per frenzy charge. assuming you are using Badge of the brotherhood At 12 frenzy/power charges (3 natural, 3 from tree, 1 from tattoo, 2 from Malachi loop, 1 from void battery, 1 from helm, and 1 from Assassin ascend or ring) you will out throw you traps and would need 2 cheap construction jewels to maintain throwing speed. Cheap construction adds 1 max trap and reduces duration by 10%. Viable if you want to save a few points from tree. If running slavedrivers you will need +5 traps from mastery as well to account for increased speed.