From a Datsun enthusiast site:
"Tom Nalle designed and built a conversion kit to transform Datsun 240Z sports cars into a quasi-replica of the Cobra Daytona Coupe. The kit consisted of a set of fiberglass panels that were attached to the Datsun body. Datsun running gear could be used or an engine swap was available to fit a Ford 302 under the hood. Nalle was located in Richmond, Virginia."
-Harold Pace
page 151 of - The Big Guide to Kit and Specialty Cars