Always been intrigued by these, but Maine law requires our 330s to be completely submerged. Haven’t figured out a way to make a float for a submerged trap.
Hmmm . .... now there's a challenge. Longer arms on the float. A dive stick across the mouth with something like a KB stabilizer attached to the underside of the dive stick that would guarantee your #330 would be fully submerged 24/7.
Then three lengths of threaded rod that would extend above the float to wall off any that want to crawl up, as well as extend down into the water to allow just one opening through the #330. Washers and nuts top and bottom. One at the point, one each at the end of the wing.
Then . . . a fella could take a length of burlap, width cut to the distance the rods hang down in the water, length enough to attach from one rod near the trap to wrap around front rod and back to other rod. Hmmm .
.clamps on the burlap to keep in place? Same for three rods on top.
Now . . . to keep things simple, the three rods and burlap could be transported separately from the floats. Each rod could have a two nuts positioned at the right location so when the rod is shoved up from the bottom through the hole, it will be at the right location top and bottom. Two nuts cinched to keep them in place. Then a third nut could be spun down from the top to keep the rod in place. Floats could then be stacked.
Sounds like a cluster. . but at least it's a place to start. I do believe once you figure it out, and are successful, you'll progress to an improved model. IMO, it would be worth the challenge.