Have a look through the GS Knowledgebase in my signature line.
Much of the Sahara is stony desert (hamada). There's hardly any sand dunes in Morocco, just a bit at Mhamid south of Zagora and a larger section called Erg Chebbi south of Erfoud.
The Michelin 742 map is as good as it gets and covers all of Morocco plus Western Sahara. Your best bet on route planning is to read the guide books, decide where to visit and then connect the places using as many as possible of the green-edged (scenic) roads on the Michelin map. My personal favourites are the Middle Atlas around Azrou and the Anti Atlas around Tafraoute.
Once you are out of the north of Morocco, on non-mountainous roads you can make better average speeds than the UK due to the low intercity traffic volumes. But don't get suckered into too many miles per day; leave lots of time for exploring otherwise your memories will just be of the tarmac.
Tim
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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