Are you looking for the company Fibrapol, that made the body panels?
Or maybe Miquel Molons, founder of Selex?
In any case I also think CrazyAutopuzzler should get the point, because my info says the car was the fruit of a collaboration between Autotécnica (Madueño's company) and Selex (where Xifré was lead designer, and supervisor of this project) over a SEAT chassis. Selex subcontracted Fibrapol to make the fibre panels. Madueño's intention was to sell the car in small numbers, but that never came to pass.