[Graham]

c) wheel diameters to be to scale

Where are you getting a definitive list of wheel sizes for all these cars?

No, I don't propose to be checking every wheel size at the start of this proxy. Basically the wheel size should look right and not look undersize for the type/era of car, but I will be checking that front and rear wheels are of the same size, if not I will apply a penalty at the end of the series.