Neat! It actually looks fairly simple to tie too once you cut the legs out just right. Only thing I'd be concerned about is whether the legs will hold up. What're they made from?
FWIW - they seem to work just fine - I'm happy with the weed guard moving out of the way for hook set:
Some tippet spin and wind resistance with the gurgle mouth and suede legs. They throw better on a 7 or 8 instead of the 6 weight used for this episode.
All, it's a bit like casting a parachute. The mouth opens up and you can hear the whole assembly "wuuush" by your head. Two of the three I've fished developed some nasty tippet twist even with stiffer Mason mono in 2X. Other than shape, The legs aren't as lifelike in the water as I'd like. I'm sure they also contribute to the poor aerodynamics. The pattern I modified originally calls for rubber legs as seen up front. Guess my modification is not an improvement. Still, they work!