this is a neat car! I built one but I just built it out of the box with minimal mods, which means it looks pretty breezy from the side view! its one I would love to do a proper job on one day.
those stars...I would make a mold of them by pressing some silly putty against them and then pouring some mixed 5 minute resin in that mold. shouldn't be a big deal. then just sand them smooth, might be a good idea to drill some locater holes like suggested, and continue with your body smoothing.
its gonna be like a boat in a bottle to get the interior painted and installed with the body sealed and painted.