I don't know what you're looking for. It's not meant to be anything else than a Basilic by Carrozzeria Watanabe. It's just a retro styled roadster based on a "modern" car, it's not inspired by any specific vintage model.
A source describes it as "Nissan Fairlady Virgirk Watanabe special racing vehicle", is it what you expect ?
Another source says "the strange open car is "BASILIC" made by Carrozzeria "Watanabe" who can be said to be the first Carrozzeria in Japan".