[JasonB]

Here's a design which just about squeezes into your space.

   

I tend to agree with Ken that these "plate of spaghetti" type layouts don't always make good race tracks, but the good news is that the set has so much track that there are a huge number of options available. If you get a track layout editor such as Ultimate Racer you can have a play and create different layouts for yourself.

Here are a couple of simpler options.