What is sad is that the Vert is more expensive than the NISMO.
I have always wanted to build something off the wall. A NISMO bodied vert has not been done yet. It reminds me of Chris Forsberg's old 350Z Vert Formula D car with a NISMO aero package.
If money is no object, go the route of the Roadster and make it a "NISMO" edition. Otherwise, I vote the NISMO coupe. Less headache with leaks, less maintenance, ability to do track days and ultimately cheaper in comparison.