Road Champs had one, in their "Flip Top" line, with a working convertible top. They pop up from time to time on eBay. I forget what scale, it's bigger than a matchbox.
It's not the most accurate model but it's close. I have one, I can post some pictures, I don't have it on hand at the moment.
If someone is good with 3d modelling, I'd love to get a nice accurate model to 3d print