Couldn't they just remake the mold? Surely something like that can't be LosTech, right? Mind you I don't know anything about cars or car manufacture, so I might be talking out my bum here.
They could, it was upper management's decision to stop production:
Pontiac upper management, already worried about losing sales of their Grand Prix models (the Can Am and the Grand Prix used the same dashboard and console, so a sale of a Can Am was seen as a loss of a sale of a Grand Prix by some senior Pontiac executives), decided to scrap the project after approximately one half year of production.
I hope this is in the DC universe, because no amount of bullshit gets Frank past the initial HOLY FUCK IT'S PUNISHER! in the Marvel Universe, never mind to a job as muscle. Needs one more panel with a guy off-panel shouting "Nice parasol, faggot!"
No, she's not the first nikke or the origin of all NIKKEs. There's plenty of NIKKES before her, standard mass production Nikke even exists before the rapture invasion. But she's the first one to equip Her powerful body since she was a Fighter Jet Pilot and also Ace Card in her squadron. But all those experiences her brain is still can't withstand the side effects of her NIKKE body.