I'd say it's your Sierra now so you do what you want paint, wheel and engine wise.
It's a bit marmite anyway, but I reckon diamond white will be great
I've got a rear bench from a dark cloth interior in my loft, maybe some door cards? I'll have a look if you would like? It's not mega mint but it's a start.
I sat and looked through the full thread last night, I love all the history and the old photo's magazine clippings etc but it is all just history...
You take it on a new journey mate, otherwise it might have just sat rotting away. Good on ya for giving it a new life