Hi Theo
I'm the person who is behind the www.eurovelo5.com blog (and the map that Chris in Switzerland quotes in his reply). Don't hesitate to get in touch if you have any questions. When do you plan to set off and from where? Like you, my aim is to avoid the major raods and hopefully take in some spectacular scenery....
Good luck with the planning
Best wishes
Andrew
apsykes@hotmail.com