Very cool, good luck.
Remember to always to set it up on fairly level ground. Otherwise there will be a void under the bottom ring which can encourage pigs to start digging...to get out.
The other thing worth remembering is because of the design, the entire circumference of the trap is basically the 'trap door'. You will want your target animal(s) to be as close to the center of the trap as possible before triggering it. Any pigs near the edge...stand a good chance of running underneath the trap before it falls completely.
The farthest a pig can be from 'freedom' is the radius (half the distance of the diameter) of the trap. But...that doesn't mean a pig couldn't run from one edge to other, instead of the shortest distance.
Should be great fun...and I wish you the very best. The more of these pests we can get rid of....the better.
Please keep us updated and congratulations on your new trap.
Spartans ask not...how many, but where!