crash&burn

Hi guys I have a 90 spec s2 RST that has never been welded or had any panels being that it is 26 years old I would love to have it painted under the engine bay etc and a full body paint (body has had areas painted before) Do you think it would be better it I paint the engine bay and replace all the stickers on the slam etc or do I just leave it showing its age with the original stickers and dull paint under the bonnet? dont want to make a mistake