I look forward to your results! Didn't Tesla try a nitrogen cooling system in the Roadster as an experiment a few years ago when Joost was still there?The last parts are arriving Saturday for a not-in-car CO2 cooling test.
20lb CO2 tank (aluminum tank at 24lbs plus 20lbs of CO2), inverted to draw off liquid CO2 from the bottom (the tanks with a siphon tube are steel and much heavier), running tank pressure down the lines (3000psi rated), feeding two nozzles which go from ~800psi liquid CO2 to spraying mostly fine dry ice.