Yeah, I think I was really visualizing a modified brew-in-a-bag system. I was thinking about using a steamer rack like this on the bottom of one of my two 10-gal coolers:
The element would be suspended above the bottom of the plastic cooler and slip under the rack. The bag-o-grain would sit on top of the rack. I still have a new Grainger pump and speed control that I bought to use with a RIMS that I built back in the 90s. I was thinking about recirculating from bottom to top. The element would only be on as needed.