i have been looking at the steel sheets as well Mick.
the GT40 i want to build calls for the use of EN2B sheets, which is an old english standard.
comprising carbon 0.15 max
Manganise 0.50m
Sulfur 0.05
Phosphorus 0.05
i am not sure what sort of sheets you can get in South Australia, but i havent found any EN2B in Melbourne.
i have been going through the bluescope steel site.
http://steelproducts.bluescopesteel....ary/datasheets
I haven't got much past that at the moment. Since this will be forming the monocoque chassis, i am considering the cold rolled CM350-G, which as a 350MPA strength. My only concern is if i will be able to form it easily.
Ryan