Sad to hear that. Flew this route myself some months ago. Don't have charts to hand, but if memory serves well, MSA is around FL 95+. Terrain very rugged and area prone to severe turbulence (I didn't encounter any, but know several pilots who fly this regularly and have).
Frankly, don't think a PA 28-181 fully loaded (and, this being Morocco, probably on an above-standard temp day) is such a good idea for this run.
RIP