At the minute there are 2 possibilities...
Mixed surface... carpet/matting and slippy wooden bits to make it interesting
Or...
there may be a chance of being able to build an indoor astroturf track for the winter, but cannot confirm until it happens...
but will definitely be different to flat carpet touring car track with a few small jumps
will let you all know asap and will get pictures up as soon as the venue is kitted out for the first club meeting, which will be early October
Thanks for the interest