Definitely worth a golden needle from your local automobile associaion. I just add the travelling times.
Munchen 1 day -> 2 hours from Munic to Füssen, rather more in the evening traffic jam out of Munich.
Romantische Strasse from Fussen to Rothenburg ob der Tauber (1day) -> 6 hours if you really take the romantic road, less on the parallel motorway.
Nurnberg + Bamberg (1 day) One hour from Rothenburg to Nuemberg, one hour to Bamberg.
Schwabish Hall, Maulbronn and Heldelberg (1 day)-> four hours Bamberg to Maulbronn plus two hours to Heidelberg
Through Worms to Romantic Rhine Valley - Koblenz (1 day) -> four hours
Aachen + Koln (1 day) -> three hours
Bremen + Lubeck (1 day) -> five hours
Hamburg Schleswig + Schwerin Wismar) (2 days) -> six hours
Potsdam (1 day) -> two hours
Berlin (2 days)
Leipzig + Dresden (1 day) -> four hours
Saxon Switzerland before a drive home... -> ? where is home/departure airport ?
All driving times may be reduced when driving between midnight and 6 am.
The Romantic Road - Muremberg - Bamberg - Schwäbisch Hall - Maulbronn-legs do not make sense, youre driving in circles (actually rather a cross). Skip Schwäbisch Hall (what do u want there ?) and leave Bamberg/Nuremberg for later, see below. Instead, take in Würzburg with a fabulous palace, drive to Maulbronn and follow the pretty Neckar valley to Heidelberg. If you like cathedrals, take in Speyer before heading north to Worms.
Bremen-Lübeck-Hamburg-Schleswig-Schwerin-Wismar is another circle. Skip Schleswig and do noi spend much time for Bremen , then Hamburg - Lübeck - Wismar - Schwerin (- Potsdam).
Skip Leipzig and do Wittenberg (Martin Luther sites) instead.
If you go back to Munich, the quickest driving from Saxonian Switzerland would be through the Czech Republic. Not all car rentals do allow this, keep that in mind. Staying within Germany takes a lot more time. If you have time left, you can take in Bamberg and Nuremberg on the way back.
Still ihis is a tour for six to eight weeks, running this in two weeks is somewhat a nuisance.. Hope you dont do this in winter with only eight hours of daylight.