Learning CAD software is a major undertaking and if there's only one project, I'd skip it. The benefit of CAD is largely derived from re-use of designs and if you're not likely to re-use anything, putting it in CAD is simply inviting a new complication for the sake of complication. Pencils haven't stopped working yet and, as far as I know, are still considered "green".
Learning free software is even more complex as there typically aren't organized classes or tutorials offered.
If your bound and determined to make this about dragging your friend into the 21st century without obvious up-front costs, look at Google SketchUp.
Learning free software is even more complex as there typically aren't organized classes or tutorials offered.
If your bound and determined to make this about dragging your friend into the 21st century without obvious up-front costs, look at Google SketchUp.