The body panels on the Daytona and '66 Sebring car from the rear window back were just body thickness open areas. If you are going to do a detailed version the inside was bare fiberglass.
The Fujimi kit is for the '66 Nurburing, LeMans and '67 Daytona / Sebring cars. If you are planning to do the '67 car you'll need to remove the "Parascope" rearview mirror and replace the small block with a 427. I'll be looking forward to seeing your build progress and hopefully the reference images from Midland, TX.
Ed