[cutting42]

Whilst I don't know much about GT12, running a club will be much the same as the offroad club I help run. Biggest setup costs will be the carpet and timing gear. If you want to appeal to the most people then you need a MyLaps timing system and I think they are about £2800 new. Even second hand they fetch £1500 or so. You will need timing and race control software, we use BBK Pro which is £480 but others are available and some free ones out there as well. Add a laptop and you are looking at a few quid. Better to find a club selling up if you can.

Carpet is size dependent but is likely to be around £2000 at least but you will find second hand carpet occasionally available for much less.

Track markers can be square guttering down pipe which is fairly cheap about £30 for 15 metres. You don't need jumps but budget for some gaffer tape to stick carpet and markers down and you should be all ready.

Hope this helps