You can download the blueprint kit. It is an SVG file that you can edit in Inkscape (or any other SVG editor).
There are some parts that the blueprint guide doesn't have (like fairings) because they aren't typically used in Centauir Spacework's construction. If you need to use one of those, here is a guide for how to convert parts from the Commander Oz style to the blueprint style.
- Select an existing blueprint style part and copy it.
- Select the Commander Oz part.
- Ctrl-Shift-+ (the plus/equal sign on the keyboard)