Add some mud/ debris, I don't know if you have ever trapped before, but you do want to make sure your prey doesn't see it; loose the shiny parts, and get them real dirty. Might add a stake, or some sort of anchoring device, depending on what you are trapping, and where you are trapping.
Pretty much look into real trapping, the principals would be the same, the trap would just need a "Warsy" feel. Is your character Wookiee Trapping, Ewok Trapping, might add an electrical shocking system to disable your prey if you are wookiee trapping.
Just a few thoughts.