the way does go thru the woods and over the Menteith hills, some of the way isn't marked on OS maps, especially sheet 57, the copies of 51 and 52 i have seem to have it marked. but i think although the route does generally follow cycle path 7, they've taken measures where possible to divert it onto tracks etc better for walking.
Cheers mike, i had noticed some of the campsites, tho from walking Ben lawers today i know the campsite at killin is well out the way and unfortunately the other places don't lend themselves for the distance i'm planning to cover each day. think it'll just be down to some wild camping and stopping off for refreshments wherever i can. And i suppose even if the campsites are close, i can just pitch my tent and do without the facilities
From the WHW a lot of places seem to shut at the end of oct, so i might just catch what ones there are.