[Graham]

As they did race against each other, why not.  I know there was one objection about tweaking motor rules (which is understandable as the rules have already reached the final version albeit final v2).

I did initially think of a Cartrix Lotus 16 bodyshell but was put off because it was front engined and not eligible at the time.

...maybe you were a bit too quick releasing the final version of the rules 

At the time I was anticipating running the proxy this Autumn, so the rules were released with that in mind. But with hindsight you can always be wiser after the event.