One thing to keep in mind about stones, they're wider than they are round.
If I had those materials on hand and wanted to stick to a couple of options with those materials only.
Black Hackle fibers for tail
Wire cut along shank to widen the body or wrap them around the shank, then flatten it with pliers after you wrap it with thread.
Thinking out loud here...
Tie in flash, dub black to abdomen, counter-wrap flash or wire if you have it
peacock hurl for thorax, black hackle for legs. You could wrap them similar to a soft hackle or do them like kelly does. This has been a game changer for me.
Unique Nymph Legs
another option would be to sub out the dubbing for the body and take strands of marabou off, tie them in and wrap them around the body, then counter-wrap with wire or flash. Or you could dub the body and use the marabou for the thorax.
Sometimes I think I get too caught up on all the "required" materials for a certain pattern but should instead focus on subbing stuff that I have on hand. If you saw the two tower drawers jammed with materials I've got you might think the same.