When determining where to add the overflow tank to Alan's coupe, we decided the firewall would offer the most space and cleanest look.  We made a clean tank with rounded edges that conformed to the firewall.  There's a stainless hardline the runs under the hood top support bar to connect the tank with the radiator.
	With the hoodsides on the car, you can barely see the tank.  Since this car has a three piece hood, the hoodsides will rarely come off of the car.
	Here's a shot of the finished piece - seems to blend in real nicely with the firewall.