Setting up a new indoor 1/10 offroad track

[VintageRacer]

I am in the fortunate position of having been given money to set up a school club in the school I work at with intention of getting youngsters interested in the hobby whilst teaching them some physics, engineering, etc....

My plan is to start in the school theater as the stage will make a great ready made rostrum and there is no permanent seating so we have a decent sized hall (I think) to layout some basic tracks. What sort of dimensions of room would you expect to need to get a useful space for 1/10th off-road buggies? Initially there will only be 4 cars racing at a time, but I hope kids will get there own and that number increase.

I could use the gym which has a high level viewing gallery, but it is much higher than a standard rostrum, but the space is much bigger.

Next is how to mark the track? I am currently thinking about getting some foam pipe insulation or foam swimming aids (sometimes called noodles or woggles) with pieces of old carpet on some of the corners, but maybe there is a better solution? It must be quick to put out and pack away and not be very expensive.

Longer term if the club takes off, I hope to get the kids to build something permanent outdoors in the school grounds.