I have nothing against it as a shooting challenge, but as a match stage...
It has a lot of moving parts, better have an extra SO to reset them like you want them. I don't mind pasting cardboard, but standing up a popper is about my limit of involvement with other people's mechanical toys.
A movable NT out of 3 targets is not an equal challenge to all and I doubt it would be AC approved. Put it on the right and the shooter has to pie farther than the guy who finds it on the left. If you want to be fair, you could have 4 targets and randomly swap the NT between the middle two so everybody would have to pie the same to get the end threats.
Gonna be tough for us six-shooter shooters, 13 shots and a reload in the middle of a swinger. But we are used to it.