I used to drive Kit cars, my favourite was a Westfield, and we used to have Kit Car shows at Donington racetrack, (the hopefully track that the British Grand Prix is going to be at next year).
You could bring your own car and for a fee drive on the track, or the manufacturers used to give test drives to customers if they were really interested in buying.
Here is a piccy of me in my Westy, note the video camera bolted to the rollover hoop, great pictures, but sadly won't transfer over onto the laptop as it is on VHS and is not digital, have tried to find a way of doing it but without success.