Diablo style inventory system

Hello,
So i was wondering how hard is it to create a diablo style inventory system and is it worth it.
And are there any tutorials on how to create a diablo style inventory using Unity 5 because tutorials that i found were outdated

 

There is a system for that on sale today on the store https://www.assetstore.unity3d.com/en/#!/content/66801

 

k thanks