Roller Coaster Model help

I'm building a coaster model for a contest at pki for math and science day. I have a design ready it is a inverted coaster. My problem is what to use as the track. Im thinking about metal twine but it bould be hard to show where there are inline twists and inversions. Help would be greatly appreciated Thanks.

This stuff takes a looooooong time to do. if you just want to do a wire twine, it is actually quite simple. But i would recomment plastruct. It is a really good material to use and is bendable.

I've never heard of plastruct but I am only 14. Can you find it at Lowes or Home Depot or some other place like that and what is it like is it wire or what?