Found this on a Norwegian site; floatation should not be an issue.

hook ? Mustad 94840 #6
thread/rib - UTC 140 black
tail - calftail white
butt/head - 2mm foam white
body - deer hair
hackle - grizzly (undersize by 2)

Part 1

Mash barb, start thread; wrap to bend

Clean, stack, measure (shank length) a clump of calftail; tie in/trim

Taper foam strip (gap width), measure (1/2 tail length), tie in

Brush shank with Super Glue, tie down foam to hook eye

Fold foam over eye; tie down/trim

Stroke hackle fibers back; tie in by tip