Inventory?

I'm working on putting together an Inventory for the project we are working on. I've seen a lot of really good resources including Tim's Inventory Manager, Stefan's Drag and Drop Gui Control and Mark's Saving Inventory Between Missions resource. I'm wondering if anyone has managed to stitch together these into a full blown Drag and Drop inventory that can be saved between missions using these resources or any others.

Any tips/tid bits would be appreciated :)

- Chris