You're welcome.
I don't consider it a storage issue really because I fill them up the same as you would fill up a normal chest. I tend to keep all of the things a specific toon needs on the steward with his suit on it incl soulstone, bandages, arrows, potions, tools etc,etc. Each character gets their own storage. I have 7 stewards in use so that's only 875 storage slots, storage hasn't been a problem yet.
I wonder, if the house goes idoc and falls what happens to the stuff inside the stewards?