Make sure your bit can make it up the hill, lol. But it looks awsome so far. Like PWalk said, make it able to be a downhill coarse, cause that is fun to. I like to set out a blanket with pellows underneath it to vary the terrain and have mini-ralley. I like to make drops and stuff. what-ever you do have FUN with it.
...F is for Fire that burns down the city!
...U is Uranium...BOMBS!
...N is for... Oh wait, wrong song, sorry