While I admire the determination, I'm asking myself why not just buy a heater-core?
A good heater-core like the one I use ('87-'94 Toyota Camry Nippon Denso made core) offer around 1.9m^2 of total cooling surface area.
To match that, even in a passive mode, using say 1/2" ID copper, or 5/8" OD copper tubing, would require around 10m (~32') of tubing.
Sticking a small shroud and a silent (as good as) Papst 50CFM 12CM fan on the heater-core would still result in far better cooling, and then your pump doesn't have to fight to push the flow through 10m of tubing that turns multiple bends.
Just curious.
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