oooooooo! thats a nice car!
You could try something that you could carve for the intake. A fine foam, or mould it out of magi sculpt, and carve in the fins before it sets.
For the strut braces, i'd use thin stryene rod, and heat it with hot water. solders ok, but i can never seem to get it dead straight.
would you mind posting pics of the interior? i might do a model of your car now, it looks awesome!