I think the wooden chassis was more applicable to the somewhat ugly (but very quick) Mini Marcos up until about 1969. The bigger Marcos as pictured had a steel space frame chassis of square section tubing with a variety of power plants over their relatively short production life.
As a bit of a Mini Marcos (and Mini Jem) geek, the MMs have always been Glass Fibre Monocogues.
The "big" Marcoses had wooden chassis from its initial introduction with the Volvo engine in 1964 Until 1969 when it was replaced with a steel one,
