Whats the copper thing in the line between the pump and block for? If its a union, why? Seems like that needs to go unless its in there for a reason.
One thing... the duct tape. If you dont care how it looks, thats cool, but duct tape dries up eventually. You could retape it with aluminum tape at least, if you really dont want to build/buy a shroud. That would last longer. I'd use a real shroud but thats just me. How far are the fans from the rad?
Another thing... Wont air get caught in the radiator with it mounted that way? That may be your biggest problem.
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