The D-bugger I have been tying and using for many years works just fine as a crawdad imitation, in either the mottled tan or the mottled green. I kept a 14" brown trout once for a demonstration on fish cleaning, and when we opened it up, it had a dozen little crawdads the same size and color as the bugger I caught it on in its stomach.

So I never bothered with claws, tails, antennae, and all that. The fish don't seem to care.