Bob,

Everything for the Eindecker has been drawn in SketchUp. I do use the pro version for my architecture practice but I could do the same thing with the free version.
There are a great number of plugins that allow you to draw nearly anything with SketchUp and most are free.

I also belong to the SketchUcation forum and you could learn how to use SketchUp from reading this forum alone but there are video tutorials covering just about everything available.

I use plugins for splines, lofting and I export faces of the parts to Corel for cutting on my laser. The laser uses Corel as it's print driver.

I am sure that there is some format that your files could be saved in that SketchUp could import with a plugin.

Here are some other sample SketchUp projects.
The Nieuport 11 is at half scale and the Ryan STA is at 40%. The Ryan is from factory drawings.

Larry