"Through Europe at 4 Knots' and "Watersteps Round Europe" are the other books I had in mind. They won't help much with the decision about what section to do, but they do give a lot of first hand information of the kinds of journey and problems to expect.
I'll be anxious to hear about your experiences if it all pans out. From what I have read, it is not cheap. I've considered purchasing a small trailerable sailboat in Europe with a small outboard and going that way to save some money (like the 4 knots family).

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13