I've got it all mapped Ally, although I've assumed miserable conditions throughout so there's a healthy proportion of landy track thrown in, and some slightly pointless detours to visit some random wee spots I fancied.
Doune – Braes of Doune – Findhu Glen – Glen Artney – Arivurichardich Bothy – Gleannan dubh Choirein – Glen vorlich – Lochearnhead – Glen Kendrum – Glean Dubh – Killin – Lochan na Lairige – Bridge of Balgie – Lairig Ghallabhaich – Rannoch forest – Rannoch Station – Kingshouse Hotel – Victoria Bridge – Glen Kinglass – Inverawe
I was just playing with memory map when I plotted that but figured it'd be a good route, could probably do it in three days if the weather played ball…