be warned, if you're playing V4, jumping into V5 will have a new learning curve, mainly the new crafting and intelligence system! the recipes you know by heart will be obsolete, and you will start from zero. one thing you'll have going for you is knowing what items do what, because your character might not be smart enough to know! (you can still use unidentified items)
then there's the liquid storage system, very neat, and most liquids are used in crafting in some way. (but only when in a container, some reason water on the map won't count, you can fill containers by dipping them into the water)
only 5 layers are in the game, but environmental items like produce for the 6th layer seem to be in the game through traders? one of which is used in a recipe and you need two of it... good luck with that :)