Just out of curiosity did you contact Steve at Driven Exotics? He has made a roof and you wouldn’t need to go through the process/time of starting one from scratch.
I did and he said to email him then I never heard back... From what it sounds like when we spoke, it was 9 years ago when he did it and it took a ton of time according to him in order to get it right with fit and finish... It appears like it was a great solution but super labor intensive.
In my situation, we are scanning the window brackets for the soft top (between A & B pillars) to ensure it lines up with window, etc.. and then that would be incorporated into the actual top... hopefully a 2 piece (like the Porsche CGT) so it can be stored in the frunk when removed. We are using the best technology available to make this happen.
Again, more to come but I have a ton of time already into this process and Steve wasn't the best to respond as I was curious on his costs and processes which I received neither other than what I explained above when him and I spoke briefly.