DT Stick Bridge Project Help?

I have a DT Project to built the lighest and yet strongest bridge as possible - what type of bridge should i construct out of sticks, PVA glue and right angle triangles as large as 20 by 20 - keeping in mind with the weight. Thanks

Use rectangles with x bracing corner to corner to form 4 triangles within each rectangle for the deck of the bridge. Connect several of these in an arc. Where two rectangles link, put 2 braces, one on each side, from rectangle a to rectangle b and rectangle b to c etc. forming shallow triangles with part of the outsides of the rectangles, like a series of very flat "A"s to strengthen the arc

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