lol yes thats me, sorry 
it was Just I Hit Google and Hit Tons of Response and the First few links we’re all really good. With a Concept I can’t Help you, with a more specific question maybe. I would say all you need is UMG Widgets for the UI and a BP component attached to your playercontroller for the code, nothing fancy, As Long as you don’t want it in vr. Have you looked at the Marketplace? I think in September free collection or some permanent free I’ve Seen a few Plugins or Demo Projects which integrate an inventory or at least a POC of it. If you can give a little Bit information what it should Look Like in the end, Soul maybe find some brainstorm ideas Here, but I guess for a discussion the Forum would be the better place. Here is more: question->answer. Cheers