This is an idea that could be helpfull.

It would also allow the base to store a number of minerals or allow the base to do so.

Though this could be a whole set of modules for the base (modules type: cargohold) lets say 100 space for the smallest one with a large boost with each level.

Either way it would have the same type of permissions for the base.

Also They can only be used to make artifacts or other special items for the base (or maby the base can convert them into credits on its own into its bank).

i would say that a good addition would be to allow legions you have NAPs with to trade you artifacts, minerals; your legion would be able to do the same with another legion. It would be like an inter-legion market.

Interesting. well when battle comes out we will "find" somehow other bases, but we could choose to trade with allies maybe ? Base could have credit prices set so credits for items or the reverse, from the bases cargo storage and credit storage. But never trading would cause it to do under its daily upkeep cost.