Probably turning into some sort of mapping/internet nerd but I have found researching the walk really interesting. The key thing is that there is no one source of information that takes you from one end of the walk to the other. At the European level the walk is described on the European Ramblers Association website, and even on Wikipedia, but not at the level of detail you need to determine the daily length of each walk. Wikipedia (when it does do detail)is sometimes wrong. Plotting the route, from end to end, has therefore involved piecing it together from a whole series of sources (translating the sites into English using the Google translate tool)and then estimating what the daily walks will involve.
I have plotted the route in Google Earth. Google Earth is incredibly powerful and I'm still learning how to use it. I now have a file, which plots my version of the walk, which I can "play" in Google Earth. This means I can fly virtually, place to place, from one end of the walk to the other. Nerd or what!
What I haven't worked out is how to publish my file, i.e. share it on the internet. I'm sure this is possible so hopefully I can do it soon.
Some of sources of information actually provide walking times and I have used these to plan the days. Where this is not available I've used Google Earth. Previous planning experience suggests that I can overstate my daily walking capacity (12 hour walking days in the Dolomites bear witness) so the current plan will definitely need some more work.
What the plan is telling me is that I need to walk for 172 days (I have walked 16 before!). If I walk six days, and have every 7th day of, this makes for a total elapsed time rounded up to 200 days.
If I have got this right it could work. What it means is that I could start at Tarifa at the beginning of March and spend the spring crossing the Sierra Nevadas and eastern Spain. By mid-May I will be in France and the Cevennes, going up the Rhone Valley to Grenoble in June/July. The Swiss part of the walk looks really nice and easy and I should be able to get to the tough Austrian part mid-way through August. The Der nordalpine Weitwanderweg 01 looks brilliant but is the highest and most exposed part of the walk, involves 40 days walking, so I need to start this as early in August as possible.