this boat is a 16 Levi design.
I have 2 books that have information:
- Renato Sonny Levi " Dhows to Deltas" . In this books there are blueprint/lineplans of these boats. This book can be found on www.bookfinder.com
and sometimes shows up on ebay. Is not cheap.
- Kevin Desmond " Un siècle de hors bord" In this book there are some 10 pictues of the Paris race from 1962-1966. The pictures show these boats in the starting grid and during races but they are much alike. But I think the Levi 16 design boats are shown. In the (French) text the Thunderbolt X is mentioned several times. This book can be found on french websites like Leboncoin and Priceminister. This book is rather cheap.
Hope this helps you!