As far as i can remember..
First tie in the dumbell eyes,next step is to tie in a strip of furry foam wich you trap along the hookshank towards the hookbend, work your way towards the dumbell, tie in the rubber legs, then you take the strip of furryfoam wich you bend over the shank and tie in near the dumbell eyes, at this point you can cut the furry foam into shape (on the front), finish by taking a clump of deer hair.
You can work the tread under the piece of furry foam that is sticking out on the front/hookeye.
I believe that's the way that in the Craig Matthews video the Turneffe crabs are tied.
I epoxy the bottom side for some extra durability with some white epoxy.
Have fun !