I need some help with making a MouseTrap Racer

I was given a site, but they want at least $10US before they tell you anyway how to make one


I was wondering if any of you have been forced to make one of these and could give me some links to some good sites that might help me in making one of these

All help is wanted

sweet, i done this b4. tho i didnt use no site for it...

secret is to use really big wheels ( longplays work good ).
and, try to make the closing thing of the trap as long as u can (attach some rod to it), kinda like this:

Thanks lol, already did it though, mine didnt work

Anyway, thanks for helping out