Im looking into buying the plastics (front and back) but does anyone know if they are reliable or not? the company making themthat is
You are talking about the Brazilian Company, Aluizio, I presume?
Short answer is yes, they are reliable.
http://www.aluiziomotos.com.br/v2/en/Principal.asp (this is their website)
There are A LOT of threads on this topic, including one with a tail install that I find pretty informative.
If you put in Aluzio, or Aluizo or GSR, or GS500R, you will get a crapload of excellent resources.
Overall, it is expensive and very difficult and time consuming to do but the end product looks pretty damn cool.