if you can get your hands on some foam, preferably rigid foam you can carve it into a pretty good dome, that the way i did it. Then you can bondo over it, using a bondo file at first really helps, then sand it with 100 then 300 grit sand paper
that pink foam dome is an amazing idea, i was sort of thinking about doing that but of course i ended up with "there's no way that'll work"
Thank you for proving me wrong