In terms of suggesting materials, you are on your own. But I will tell you how it is constructed so you might build your own (though in the end it might end up to be the same price...
)
The housing is simply a plastic box, as tall as a CD drive and about 1/2-3/4" narrower on each side. on the inside is a thin, maybe 1/8", sheet of foam, completely moveable. Then inserted into the housing and touching very firmly against the drive are two sheets of metal, one on top, one below, and each exit the case on seperate sides. These serve as the rail attachments and as a (crappy) heat transfer. They don't do a very good job at it, and that's why I made the blocks. I then epoxied the blocks to the sides of these rails, through holes that I cut out of the bay rack.
Construction of the blocks was quite simple. I cut two pieces of 3/4" 110 copper to be 1"x2". I then drilled a 1/2" hole down the middle of them, closer to one side than the other. the reason I used a 1/2 bit was because that was the size of the mount that my barbs had. Let me tell you there is no greater pain in the world than drilling and cutting copper without a press and a bandsaw. I hope I NEVER have to do it again.
That said, I attached one standard male barb to one end and an elbow barb to the other so that the two drives' outlets would be facing eachother.
Plain and simple and they do a fabulous job. Seriously, That rack used to get really hot to the touch and now it feels like a can of coke that came out of the fridge 1/2 an hour ago.
Other ideas? my fav is
this one. I would have done it this way if I had more room in my case of if I had seen this before I got the enclosures.
Doesn't swifttech make a HD waterblock too?
And you know, I've been thinking about it and remoting the PSU actually shouldn't be that hard.