Nice model but I'm with everyone else that engine bay and undercariage is too plain...
I f you want my opinion you can have a much better engine bay and undercariage with just detail painting...For example:
Engine:
-The brake master cylinder...GO for white main paart and yellow cap.
-The battery paint red or yellow the 'button' and add some wire if you want at the poles(or just paint them silver or gold)
-Now on the fuel rail paint it gold and add some silver details...
-Some details on the part the turbo 'sits'
-The Air.FUel meter paint some gold/silver details(it's the part before the induction)
The above details are simplea and will give you a clean and nice angine bay...
Undercarriage:
-Add some colors on the difs and driveshafts...
-Add color to the sway bars....
-Custom paint the shocks...
-Maybe add some temperature marks on the exhaust,deferent color on the cat...
So as you can see you can have a great and detailed car without having scratch building skills!!!