Hey Dave,
Hope you and your family are staying healthy!
My students will be building a Truss bridge. Besides drawing the orthographic view by hand, how about using Sketchup Pro 2020? and the 3D view too.
Can you give me suggestions how to create this for middle schoolers (gr. 6-8)?
We are going to use balsa wood, 1/8" square x 24" pieces for the truss bridge. The bridge will be only 10-12 inches long.
I found this video. It’s helpful, but, kids probably need some confidence in using Sketchup to begin with to https://youtu.be/EGy53_ylahodo what this guy is showing in the video.
2D sideview 
Take it easy!
Dave