I'm so impressed with what I saw on that video that, this Christmas, I'm going to build a rail system in 2" square box section right in front of my range back stop with a traveling target driven by a 18v drill
Ideas are thanks to Tiff at the Roundhouse who has already done much the same with his running boar range - thanks Tiff
Limitations of my site means that I will probably only shoot .22 (largely coz of the noise) at 25 through to 5 m
Should still scare the sh one T out of participants as the moggy comes snaking along the grass
But one can dream ....