On the hood pins: I add the mounting pins (bits of wire) and the protection ring (PE) on the hood but don't bother with the locking pin. I like seeing the pins when the hood is removed.
You can use sewing needles for the mounting pins if you want to attempt to make them functional.
I like dark red for the body
maybe raw aluminum the interior panels
suspension and body supports could be a mixture of metal finishes to offset them from the black underbody
just some ideas, love the build