Here are the changes to skin corpse and leather craft.
Skin corpse - Now takes time based on size of creature killed. No longer removes the corpse, instead giving the corpse a new description and disallowing further skinning attempts.
Leather craft - Items crafted by leather craft will change ac based on skill and natural armour of the race the skin is from. Will list the race of the leather used, if there is one.
It will likely be in need of balancing. If you can test it, please do. Post or email suggestions/comments/question/concerns.