To build a great trap, make sure it's out of stone it can't damage it easily. 2x6 base, 2 high walls, with wooden ramp up. Aggro it to follow, up the ramp and it falls into trap. Easy to trank and knock out. Make sure you have 100s of narcotics on hand because it wakes up fast.

Just don't do what I did, loose focus for a second, it wakes up, I fall in the trap and die, my argie then kills it. Bad day.