This is brilliant. What are the specs that are being cooled? Why the tinfoil? Is it quiet? Why switch from lovely blue coolant (antifreeze?) to pee? So many questions!
Metallic tape was often used to attach fans to radiators if the radiator was non-standard which many weren't. The image below is connecting a 120mm fan via a tin shroud to a Vauxhall heatercore. Metal tape to hold the three things together.
This also features a T-piece reservoir/filling tube, an Eheim 1250 pond pump and the grand-daddy of all modern water blocks, an original Cathar Little River Whitewater.