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Book is for 03 Denali....
Yes - that's what I and jpaeltz were trying to do. I came to the same conclusion you just stated when I first looked at the diagrams. However, others have done this and have not replaced all vehicle wiring. If you look at the second diagram in Mac's 5-24-2010 post (in this thread) you will see the harness identified as "Console Extension Harness". It does not plug in to the main dash harness as far as I can tell. A good start would be to get the harness, hook it up, and see what happens. I thought that the console connected in some way to the BCM, but I can't see that in the diagrams. I may be confusing the Lux Bose with the Non-Lux Bose in that regard and for Non-Lux I'm not sure what the role of the BCM is/would be. If it works like most other systems, all that should be needed is a connection between the head unit and the Amp. The speaker connections already exist. Now maybe the amp can't find the A-pillar tweets or something, but in that scenario, you'd just be missing some sound, but it should still work - i.e. it should still amp the head unit output.
If you have any further info, it would be much appreciated.
-B