I'm building a bridge out of balsa wood. Does someone know where I can find directions to do that?

I'm building a model bridge for my science project. I can't find directions to do that on the 3rd party web site or on Google. Can someone help me!!!???I'm building a bridge out of balsa wood. Does someone know where I can find directions to do that?
It's all about how to make good trusses. Here are a couple good websites:



http://www.garrettsbridges.com/



http://bridgepros.com/learning_center/ba鈥?/a>I'm building a bridge out of balsa wood. Does someone know where I can find directions to do that?
The following link contains a software download that may help simulate your bridge prior to construction: http://bridgecontest.usma.edu/

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