nice page! I would only suggest, that you add the following:
a summary about all routes, their difficulty and length, in the overview of the main page so that one has a quick overview on the routes (like: normal route, most difficult route, most interesting route etc.).
You should add infos about the different huts and a precise description of the approach to every hut
You should add a link concerning weather conditions.
And you could add a link to the dav-service where one can buy the map.
If this is done, it will be a perfect page with 4 stars. Now, I would like to give 3,5 stars ....