I did this route in April.
There is a "new" graded piste from Lebouirat to the R103 near Assa, if you follow Chris Scott's waypoints you cannot miss it and it was in very good condition in April.
Fuel at Assa, Semara and on the Tar road from Semara to TanTan R101 at
N27 35.974 W11 37.561
The piste is sandy in places which maybe hard work on a heavy bike, but overall it's not a hard route. The biggest danger IMO is the remoteness of this area, I never saw a sole from Lebouirat until the road to Semara.
After crossing the salt plain you can head for the new tarmac at
N27 09.368 W10 53.830
instead of using the very poor road which passes Hawza if you wish.
With the new piste to Lebouirat and the tarmac road to Semara, you can get from Assa to TanTan with one night in the desert.
I would plan to camp out somewhere before the salt plain, then get back to TanTan or Laayoune the next day.
If I was there now, I would come with you for sure, I love that area.
Last edited by twenty4seven; 25 Nov 2012 at 18:36.