This is one of the nicer installs I've seen on RR. From the top down, you've thought this out well, and I sympathize with doing it as it comes in and when you have time. Waiting to do it all it once seems great, but you might run in to a problem that you'd have seen doing it in steps. It might be more time on your part, but like you said, better to do it right than do it over (even if doing it right takes many steps).
I've always been a fan of the new PPV Tahoes. I'd add halogen lamps to roof (for on-scene working lights) and probably some black spotlights on the A pillars. Would you happen to have the 17" black steel rims (I'm assuming yes since it's a PPV)? Like I said, I've been a fan of the PPV, but I'd trade in all the install-friendly options for a 4-wheel drive, because it'd be a beast of a fishing/shack vehicle.
Looks good, keep us updated. I'm going to go change my britches now...