Red,
That's Charles that built those for his own truck. The guy is pretty bright and definitely did his homework and ended up with a great set of twins.
cchase,
I have a bunch of pics on my site in the link above of everything you need to know to build twins. What else do you need to know or are confused about? Don't complicate things, it's actually pretty easy once you get a grasp on what's involved. The hard part is making it all fit under the hood. (aside from the previously mentioned 'Hard Part' of making the 2 work well together.)
GTS,
Just like you said that you don't need custom programming to run custom injectors, I could say that any turbo that flows more air than the stock turbo will work for a twin set up. It might not be optimum, but it'll be better than a single. Even with my cheap, crappy HT3B feeding my stock turbo, the difference was amazing and quit fun to drive. The HT3B only flows like 1000 cfm, the 38R, I was told, is a hair more than that. :dunno: Haven't confirmed it, though everyone that has one that I've talked with gain about 100 hp with it so I'm guessing it moves some air...