Ok, open up your parts page in Sketch up and your gimp and lets make parts!
zoom in aon a page, in this case, my diagram page and make sure your "paper's" edges are visible. Then go to "file" and then to "export" Export the model as a 2-D graphic. Go to options and choose a size that works for you. I always pick something like 6400 just because I know I will be croping and shrinking in gimp and want as much clarity to start with as possible. It may take some time to export it, also, it will try to save to documents. I prefer it to save to a file folder on my desktop, in this case, one named CSS Texas. I export all five "pages" to the Texas folder. We are now none with sketchup for now. Everything now will be done in Gimp!
CT