Just a quick observation about your last leg, don't be tempted to just cross the road at Spital Cottage and try to enter the Fetteresso using the Spital Burn and the Cran Burn. It looks logical on the map but it is some of the most horrible energy sapping fly infested peat bog that you are likely to come across in your entire crossing. A big contrast to the pleasant walk past Charr Bothy on the West side of the road.
It is far better to make a slight detour to NO 64772 85279 and enter the forest using the good logging roads.
A lot of challengers spend their last night at Cowie Crossing NO 76444 87378 before the last few kilometres trek to the Eastern edge of the forest at (for example) NO 82536 86693 and the downhill walk into Stonehaven.

Hi Niels and welcome to the Challenge.

That sounds like a fine route. To answer some of your specific questions:

If the weather permits, it would be great to go over Meall Cruaidh and The Fara. You can either drop down on a path that goes down the firebreak to An Tochailt – see this route – or find a route east to the road above Dalwhinnie.

You may not be aware that the bridge at Bhran Cottage at NN 755 912 is no longer there; the Bhran could be tricky to ford there.

Both the Lairig Ghru and Glen Feshie are beautiful routes, but my advice would be have the Lairig Ghru as your main route and Glen Feshie as your FWA; an FWA is required for the Lairig Ghru and Jock’s Road, as you will see from the Event Details.

You will definitely be able to buy food and gas in Fort William and Braemar, and food in Dalwhinnie (garage shop) as well as other small shops, depending on your route. The debate about gas versus alcohol will rage on and on, but, as I prefer gas, I can advise you that 2 x 100g or 1 x 250g canister just about gets me across, if I enjoy food where provided whenever I can. I don’t think you will be able to buy gas in Mallaig, but I am not sure. However, if you getting the train in, for example, Glasgow, there are plenty of places where you will be able to buy gas there.

Happy planning!

Emma

PS: You will find lots of advice on this forum; this thread in particluar has some good advice for first timers.