Looks good. Personally, it would be even better if you got rid of the style bar. I do like the ducktail.
I used to like it at first and got it pretty much for free but I've grown to dislike it. I've looked for, pretty much since I got the car, for a specific rollbar setup which I've only recently found and have ready to install, it's just a question of digging into it. Big job.
I like that you know what you want and have sought it out. The part that really puts it in the rice category for me is that stripe. It screams late 90s and feels like underglow and clear taillights would match. Knowing it’s in homage to the cars of yesteryear makes it a bit more palatable. And at the end of the day... it’s your car and if you’re happy I’m happy.
I've found it's definitely mostly 50/50 with people and might be one of those love it or hate it things, I absolutely love it but you said it perfectly, to each their own. On a side note, I googled underglow mx5... I knew underglow was tacky but I think it might even be worse on an mx5!