A good area to explore. Twenty years or so ago my wife and I took our bikes through from Dalwhinnie to Fort William a trail that takes in some of what you wish to travel over.
Although we carry a light tent for our trips it is possible to stay in Bothies during this walk. For us at Culra, Staoineag and passing by the one mentioned at Meanach. Coming in from your start point there is a bothy in the Lairig Leacach just below Stob Ban that I have used after coming over the Grey Corries.
I think that the connection from Corrour to Rannoch Station will be using the old Road to the Isles....never used it personally but my daughter came this way during a trip from Skye following the way of the trails used by the Drovers heading down to the markets further South.