Dave I was photographing one of the spare J chassis in the mid 1980's that was made up as a lookalike MKIV 1967 winner.Turned out to be numbered J-12. The painters 6 years old was allowed to sit in it but he needed help in getting out. This was mainly due to the MKIV dash panel which stuck out much more than the GT40's The cockpit of the MKIV looks smaller than the GT40. After all the 1967 MKIV and the 1967 M1 Mirage were both built to J regulation which allowed smaller area of screens.
Regards Allan
Regards Allan