Thanks Jes and Kaiser.
To answer your questions Jes, I use Inkscape, which is very much like Illustrator, but free online. The Nebula class refit...it's certainly on the list of things to do. The original drawing was done in Paint Shop Pro so to get back to it, I'd probably redo it with Inkscape. As I said, it's on the list of things to redo in Inkscape, along with a number of my older Trek drawings. So I hope to get to it eventually.
I've done a couple other recent Trek designs in Inkscape though, so I'll post those soon as well.