[Si Coe]

Anyone who's ever driven at Cheadle will know you don't really need a lot of space to run a 1/10th car. Their whole hall (pits and race control included) is smaller than Ribble Valleys track alone. I'd say half a tennis court for the track in total.
BUT
Whilst you could use your Durango, you'd soon find on such a small track (longest straight is only 5-6m) that your fancy 6.5t motor is actually a hindrance. And its not just a case of 'I'll turn it down' or 'I'll go gently' - the reason different winds exist at all is that in these cases a milder motor just works better. As you can tell, the older hands here are talking about 20t plus (brushed - so 13.5t and upwards brushless) motors as the weapon of choice for tiny tracks. So you get a 13.5t- and spend what? £50-60 for one of the cheaper brands.
And the next week, someone will turn up with the previously mentioned GT14B or similar and run rings around you because its better suited to the track.
At Cheadle I found my Cat with an Ezrun 9t was much better than my D4 with a 5.5t Novak -but my RC18T was even quicker (when it worked!).

If you want an indoor track you can use your current car in its present configuration in it needs to be no smaller than Roundabout were using.