That aircraft was not F59EE, it was 59EE, and that did not indicate it was a prototype or experimental aircraft. Microlights in France do not have an F registration, they are identified by the number of the department they are based in and two or three numbers. Ultralair, the manufacturer, was established in Valenciennes, Nord department, which is number 59.
Here is some background information on the AX3, including the assembly manual.