It would work very similar to Boom Beach where in the resource bar you could see not only what the max capacity and current resource level is but also what your current production rate is. It would also be really nice if the amount of resources from your storages you would stand to lose if you were raided would be was shaded in a different tone as well.

It would be a great help when planning ahead for what upgrades you plan on doing or deciding if you should break your shield or not to go raiding. All of the information can be calculated if you know where to look so I don't think it would unfairly alter the integrity of the game.