Really quick post, I'll get to photos later but I have a result to share. The pump was powered by 1 LiFePO4 Battery, I was able to generate 5V at 500mA into a 10 Ohm load using a propane torch on the hot side (the little 1/4w resistor couldnt take much more, it started smoking). I initially used cold tap water, but it quickly became warm. Obviously this opens up to phase 3 (2?)..which would be to make a radiator. I plan on using small copper pipe, 1/8th in diameter.
The waterblock leaks..not too much of a problem, I have to get some silicone sealant or cut a O-Ring gasket (but I would need a round nose end mill).