Jsut to follow up what I was saying, years ago (when I was more into backpacking - I prefer a roof over my head these days and preferably a decent pint of bitter at the end of the day) I planned this route.
It started at Attadale so I could do it without the car, and I designed it to see the best scenery of the area.
It included Glen Affric, which your plan doesn't, but is quite similar in many other ways.
It included Cannich half-way around. I planned to avoid carrying too much by buying the food for the second stage there.
It also included Sgurr nan Ceathreamhnan which looked to me like the finest mountain of the area, and its ascent combines well with Falls of Glomach.
done from memory but this is pretty much it