Years ago I used to correspond with a Marc J. Frattasio. Mark was an early online authority in the 90's on the models used in Gerry Anderson's TV shows.
Marc knew about the die-casts which appeared, the model kits bashed and the actual materials used for the shows' vehicles.
All of his findings were originally on the TV21 and the SuperM websites.
Here's a taste of his old Thunderbirds observations on SuperM.
What do you think?