I think I might have gone a little over-the-top with this one!
The side pods were from another scrap Scalextric car and most of the added panels were sticky-back-plastic. The rivets were more sliced plastic rod and most of the bits were superglued in place.
The rear engine bay was from another car model (sorry can't remember exactly).
I have 'aged' the body work with a round bur bit in my Dremel. It shows up if you 'click' on the images to get a larger view. I should be starting the painting soon.
Stay safe and