how hard do you think it would be to make a pack mule mod?

>first domesticate a large animal like a muskox or something
>add some new recipe for animal storage bags
>add storage hitboxes to the animal so you can shift+right click with a bag in hand to attach it to the animal (similar to elk)
>allow multiple bags for more storage
>some way to swap between animal behaviors (following you and staying put)

So you'd basically have an animal that follows you around and carries all your stuff. You can tell it to stay when you go cave diving. I have no idea what I'm doing or how to do it, though.