That sounds awesome Zwitter do you have any pics?
I recently ditched the immersion chiller and invested in a plate chiller. SO much better! From boil to 22'c I one pass so I can pretty much chill straight in to my fermenter.
Keeping in mind that my setup is basically a Braumeister, the best part is that I got some 1/2" tube that I stick down in to my pot and insert it in to the skin fitting at the pump output. At the other end of the tube I have a hose to the plate chiller. Start the pump and off she goes. Either put the return back in to the pot to recirculate and bring temp right down for lager, or as I mentioned before, one pass gets it to ~22'c and can put the hose from chiller straight in to the fermenter.
I'm using the 70mm keg king plate chiller.
Would prefer if it were serviceable as I can't really tell if it's clean inside, otherwise it works really well.