On Jan 16, 2008, at 9:01 AM, David Davidson wrote:

> In the past the students created blueprints on graph paper and then  
> used these drawings as templates to build their bridges. This year  
> the teachers want their students to do be able to create their  
> drawings on a computer and print them out as templates to build  
> their bridges on.

If they were doing covered bridges, I'm sure that GoogleSketchup  
would work .. but I'm not sure about building classic or modern  
(single tower) suspension bridges.