You are talking about the black plastic yas?
Bear in mind that it isnt solely for cheapness..
If all the black is done body colour,it will make the car look chunkier and shorter,but may improve the cohesiveness from other angles.
Photoshop or paintshop your car with lots of different photos to see how it might look.. Do 50 photos even it costs nothing.
Side strips done in body colour.. my local dood would do them for 90 euro about £70 including sanding the plastic flat.
You could extrapolate the costs to the front/rear plastic.
If you do take the plastic off yourself and sand it flat, you could wrap it in carbon fibre vinyl.you can even wrap it without sanding flat,but you wont get a perfect finish unless you do it with a singe continuous sheet.
You wont get a vinyl to the exact body colour.
The colour itself shoul be on a panel ,probably on the driver side door jam info sheet.
If not, Paul/Vel might have more info.