Ken Oakes the chief draftsman at Brlstol Cars during the Arnolt period tells me that the material is Armourply or Mallite made by William Mallison and Sons and supplied to the aero industry at the time. Armourply uses a plywood core and Mallite uses a balsa core. Mallite was used in certain locations on Concord and was also used in Cosworth and McLaren F1 cars in the 60's. the difficulty is now trying to find some as Wm. Mallison are no longer in business.
I'm making some floor panels at the moment. The firewall uses .0310 aluminum either side of the ply. I think the floor is a little thicker. Perhaps .05
I have a supply of the cadge nuts, they were made in New Zealand. How many do you need? Contact me on
Mcgou@msn.com
Peter