Further research has indicated that the Forsthofel LeGrand Mazda FA(5000) was indeed the monocoque tub FB version.
I don't know how to include this without attribution, so if that means more "red points," so be it.....
Quote:
The ’72 Mk14 was the most radical and advanced car LeGrand was to build. A replacement for the aging Mk6 FB car, the Mk14 featured a completely new chassis and had the potential to move LeGrand Racecars from the ranks of club racer to the professionals. The chassis was fully monocoque, the only LeGrand to use this construction. The chassis was beautifully made, was reasonably light and very stiff, able to get the power to the wheels. Front and rear wings were now standard fare in 1972. Only 2 examples of Mk14 cars were reported to have been built.
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from:
http://sports.racer.net/chassis/legrand/history.htm