At the moment you only have one Hub from the Host build. You can build Crafting Stations and after research you can build personal storage boxes like the little hub storage box and place them where you want.
I dont know if there is a lock mechanism that you can really personal your storage box and only you have access. Didnt try this because i played with my mate and not against him also there are no items that my mate my not have for use.
You can drop items on the ground and everyone can pick them up.