The intercooler that I use comes from a Saab, it is an all aluminum cooler that I have welded a water jacket around. I also had to cut one of the elbows off and weld a straight connector on.
It fits behind the left taillight and it keeps the hoses to the turbo and intake manifold really short.
I will be using an air conditioning evaporator mounted next to the Vanagon radiator with a cooling fan, the fluid will be pumped around by an electric water pump through the engine oil cooler, transmission oil cooler and then through the intercooler.
This way I don't have to run hoses for 3 coolers to the front.