I'm probably going to make a trip to a junkyard at some point to pick out a heatercore for this project. Seems like the most cost efficient way to go at this point. I'll look for something with copper tubing. Seeing as I'm also going to be disconnecting the tubing anyway, I could add some new coolant. I'm wondering if there's something else which is a little better than antifreeze that will work for this. Also, I'm not quite clear as to how cranking the pump for a fanless design would actually benefit the temps, as it seems like it would make more sense to allow the coolant to have the most time possible in the radiator.