Hello,
I have five years of experience with C#. I have three with UnityScript and Unity's C#. I have 1.5 years with the UFPS library for Unity. I have three years with Game Design.
I have a base inventory system concept that can be used, but a few questions must be answered first:
Do you want to use the standard UFPS_item for crafting? Or a custom item type/interface for the crafting? I have some more questions if you accept my proposal.
I invite you to contact me via Freelancer or Skype (skype username listed below) to further discuss the details of your project so that i may begin working on it.