I am about to start on it too, it is great isn't it?
If you haven't already, take a look at White Ensigns photo-etch kit for the S100 ( http://whiteensignmodels.com/ ). It'll make a great kit even more so. Highly recommended!
You may also want to have a look at http://www.prinzeugen.com/ which has quite a bit of info on the S100.
Also: http://www.modelwarships.com/features/ships/s-100/schnell.htm for both kit-info and S100-info.
Cheers,
Jan Martin Wagenaar