I plan to make a body kit — logbook Toyota Corolla 1994

So, as far as my free time, I plan to make a body kit for bumpers and sills. I'll start with the rear bumper. Why from the back? Because I have two of them, after a small accident a new bumper was installed on the car, and after some time I reanimated the "broken" bumper. So, in the presence of an experimental bumper, I want to start making a body kit from behind.
I want to do this miracle of tuning myself, I re-read a lot of information in the vast "web", how people on their own, in garages, make beautiful things from fiberglass, that is, epoxy and fiberglass. That's just what kind of design to do, I don't know yet, a lot of ideas, a lot of examples, it's just that my eyes run wide. The only problem is still time, since I have very, very little free time.