The power scour was just another name for the Hi temp wash. I used one at a neighbors house that had it.
Yes they came in stainless steel. Several different variety’s. The mid 90s Ultrawash came in a stainless steel exterior, towards the 2000s they made an Elite version & it had a stainless steel tub and came in a white black or stainless steel exterior. Several Kitchenaids had a stainless steel exterior. There was several of the whirlpool models that came with a stainless exterior to choose from, but I’ve only ever seen the stainless be offered from the late 90s to the end of the whirlpool branded Powerclean production. There was even a quiet partner two with the most recent tower style wash system available in white black or stainless steel exterior I used to have one.