AU3 tidy up advice

[xafairmont]

Hey!,
just bought my first AU falcon family hauler looking for some advice cleaning her up a bit.
Story is an AU3 SR wagon $1000 with a month rego, dealer fitted dual fuel, 290k & go fast red! Was an old blokes from new who had his "mate" service the car though not very regularly as I have been discovering! Plus the car had not been cleaned for a long time!

I dont want the missus driving around in a ******* and want to make it reliable and clean, plus pass pink slip soon.

So far I have washed & polished the car & the paint came up schmick (can highly recommend Turtle wax scratch & swirl remover). Also have drained the auto trans oil (not a full flush though) with filter kit it was black & done an engine oil change, air filter fine, will do a radiator & coolant flush soon, brake fluid looks fine. The car drives great no suspension rattles or interior squeeks & everything works. My questions:

What else would you change/replace?
Front armrests are well worn, I am guessing most second hand ones are too what have others done to improve them?
The engine bay is filthy with baked on grease under the sump & trans what is a good way to get it off?
Please link me to a good headlining replacement thread!
I will need a couple of parts so will place a thread in the WTB section as well.

Thanks!