Thank you Cargoman.
Glorfindel, I have yet to build a preprinted kit, although I do have 2 in my stash. So yes all the parts are printed out on my printer. I use a 6 ink printer, that way I do not waste ink, as compared to a standard 3 ink colour cartridge, which when one of the cells is dry the cartridge is no good. Plus with a 6 ink or greater system not as much colour mixing as compared to a standard 3 ink system, therefore the ink lasts longer and more ink per cartridge.
At the moment I have only engineered small parts and addons. As well as recolours. For software I use a 3D CAD program for the design, a graphics editor, ie like Photoshop or Corel to add colour and graphics. Then a program, Pepakura designer to unfold the design and create the pieces.
As I mentioned I'm learning a new graphics editor "Inkscape".
There are still some people out there that do all the design work by hand, " old school". Now days I only do simple parts by hand.
Jim