I did an external enlosure that housed my pump, radiator, and resivior. It was fairly huge. I currently have plans to scale it down a bit. You can see some information on it
here , with more pictures
here if you're interested. Might give you some other ideas. I would definately use some sort of sealing quick disconnect fittings on the lines going from the enclosure to your computer, it will make dealing with it much easier.