I'm working on a Spider Were-Form character concept, and I was considering using Echoes of the Beast's Beast Trappings to represent web spinnerets. It would be a trapping of Might, that could only be used after a successful grapple. A Might roll would be required to wrap the target in webbing, and they would be considered to be continually grappled by a block of 2 less than the Might roll, representing the webbing. Does this sound good, or is it too powerful?
Also, I know that Beast trappings extend to the Human form, but I like the idea of the character retaining his spinnerets. I picture them transferring to his elbows.