hi Bob ,
I have been using this method for some years with good results , it is particularly good for delicate parts that would disintegrate under sandblasting .
You can use Caustic Soda in the electrolyte solution as well as washing soda , it will remove paint as well as the rust . Caustic soda is a bit nasty and it burns skin so you have to be carefull .
It would be possible to use one of those kids plastic swimming pools and try doing a whole chassis . The great thing is , it is so cheap .
You have to keep an eye on the charger to check it isn't overheating . Also , I would not leave it un - guarded overnight in a shed .
Mike
