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Mike,
Consider that Phil is shooting at f/1.4 for his 8 second exposures at ISO-3200.
I'm not sure you'd want to push the 40D to ISO-3200 without some kind of noise reduction. Even at ISO-3200, I don't think the 40D files are going to be as clean.
Also, consider, that at f/2.8, you are still two stops slower than f/1.4, so, you're still going to likely be shooting 30 second exposures, unless you're under some really dark skies.
Just a hunch, but, still worth a shot, because once you've reduced the RAWs down to video resolution, you may still be able to produce decent timelapses. I guess the other thing to remember is that you can always push the RAWs a stop in brightness in DPP. Might still be worth it.
H
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