Basically, what I did was bought two Imerial fans (made by Hayden), part no. 226114. They were $70 each. Then I bought Imperial part no. 226206 which is a preset thermal switch with a probe that will go through the radiator a few inches below the top hose. 226206 also comes with a relay and a harness, it costs about $26. I did not use the harness. I then bought a 4 position fuse block from a local auto parts store, about $3. I already had two relays from other projects, otherwise I would have had to buy two. Lastly, I bought two 30 amp switches with LED's, about $5 each. I then had to figure out how to wire the relays to get the functions I wanted. There may be a better way to do it, but my current configuration works.
I made a shroud out of two anodized steel shelves from an old equipment cabinet. Although I intended this shroud to be temporary, it is sturdy. The shroud covers the radiator completely and is about a half inch thick. My thinking on the shroud is that the fans will cool every fin on the radiator (similar to the factory shroud and clutch fan), not just those fins that are directly under the fan diameter if the fan were mounted directly to the radiator. My primary reason for mounting everything to the shroud was so that I could have as much of the wiring done as possible when I went to install it.
I'm planning on making a fiberglass shroud, but I'm in no hurry.