Having done two pop tops I can tell you that the quality of the tint base for matching your color makes all the difference. I did Rusty with the cheaper tint base that my local auto paint store had. I had so much in the project already and didn't think it would matter. It did. I think it was Nason, a common auto paint brand but not top tier. The second time on Twogone's van he splurged for Dupont tint base. It matched a lot better.
I would love to do this with a fixed top but honestly I don't think the bigger area of a fixed top looks as good when contrasted with the smooth paint on the rest of the van. It's all personal preference of course.