It depends how well you have developed the plug and able to transfer it into a molder. Once it is done, you can copy many numbers of FG hull.

Thanks a lot for the video Maharana Sir,it will really help me out. I just got my wooden boat frame work done, still have to cover it out with wood to make a proper model so will take some time and still waiting for the raw material to experiment with fiberglass.
Will post some pictures of it soon.

This is also and helpful tutorial on How To Fiberglass,
http://www.wikihow.com/Fiberglass