Start Veevus 140 on the SL45 hook and tie a pair of painted lead eyes on top of the shank about one-third back from the eye so the fly rides hook-point up. Lock them with X-wraps and a touch of Zap-A-Gap.
Wrap thread to the bend. Turn the hook point-up and tie in a clump of large northern bucktail for the tail/wing, roughly one and a half shank-lengths long.
Add a few strands of Krystal Flash over the bucktail.
Dub a rabbit-dubbing body forward from the bend, building it up around and in front of the lead eyes for a shrimpy, crabby profile; pick out the dubbing to suggest legs.
Whip finish at the head and coat the thread wraps at the eyes with Solarez UV Thin; cure.