Hey, another STL guy! Not bad looking for 3 bones! Have fun with the pan since the motor has to be jacked up to clear the crank. The only other thing I'd do that wasn't on your list would be replace the LIM gaskets with the updated aluminum ones and a coolant flush/change to get rid of the DexCool junk which has probably muddied up pretty well by now. How many miles on it?
Didn't know the 00 GTP had the option of the crosslace wheels, unless the previous owner changed them out. Looks like it was hit in the back at some point too, time to hit up a JY and grab some white bumpers. Would be cheaper than paint and make it almost 100% as the body looks really clean. Speedway over in IL might have some. Still a solid looking GP for the age. Any rust in the rockers or the rear strut towers?