You can start skinning devilsaur as early as skill 270, but I recommend you wait until 280 so that you can skin all of the devilsaur you kill, they range from 54-56. Once you collect 8 devilsaur leather you will be able to make the hands (need 30 rugged leather as well but can buy in Auction House for fairly cheap or farm the Gorillas in Northern Ungaro) or if you choose you can save up until you get 14 devilsaur leather and make the legs (requires same amount of rugged leather as indicated above). On my server the hands sell for about 40 gold and the legs sell for about 70 gold, you could package them as a set and get rid of them pretty fast.