This is the same method they use to reclaim stuff from shipwrecks like coins,and cannons,other metal objects...from what I gather,the current goes into the object to be de-rusted and flows towards the anodes,sort of like the opposite of welding,instead of depositing metal,your removing the corrosion and oxides from the inside out...
I bet it ends up cleaner than sandblasting,and without loss of any good metal..
As for the wire mesh cover,maybe plastic coated fence or some other non conductive stuff would have to be used so as not to short out across the anodes...
One guy on another forum found his cat dead in the tank he made and was using one morning, and he and his family was devastated,they had it for 12 years...

--evidently it climbed up on some stuff next to the tub and he doesn't know if it tried taking a drink, or fell in,and was either electrocuted or drowned..
The day after,he found a dead mouse floating in the tank,so he thought the cat may have been chasing it the day before,and it fell in,and the mouse got away..only the cat knows what really happened..