new body silverado WT into an LTZ

i just bought a new 2008 1500 silverado reg cab WT with onstar and xm and power windows and locks. i got the delearship to reprogram the tire presure sencer module to acept keyless entry witch its not sapose to have.
 
now i have a few questions i would like to make this truck as close to an LTZ as posible now if i make them order the keyless start module will it work on my truck sence it has keyless  entry now?
 
and i have read the forums on installing factory nav units and i think i know what i need on that if it will work?
 
i am also wanting to instal  factory fog lights is the truck pre wired for that for the most part i would think it would be?
 
i have the guage pod that only has gas and temp i think this will be easy im not shure but i want to upgrade to the one with battery and oil presure?
 
i have cruse control on the stering wheel but i would like to add radio controls as well as a new leather wraped wheel i think that should just plug in but i dont know?
 
one last thing is if i add power seats is there a wiring harness that i can probly get for that?

i also have plans to change out the dash panel (gray) for black and do the same with the door panels.

Welcome to the Chevrolet forum.  Sounds like you have some great plans for your ride.  Be sure to check out the section on your truck.

http://www.extendedchevroletwarranty.comWelcome to the Chevrolet Forum!!!
 
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