Just come back from there Rickmeister. We did relatively short and not-so-technical routes deliberately, but had a great time – recommend getting the boat from Mallaig to Inverie and riding up to Lochan Dubh -wonderfully remote and atmospheric. I think there’s a good ride to be had north out of Inverie over to the next inlet too (could see it from the boat out), but we never got back to it. Good little manmade trail at Inverie as well (and a good pub!).
Also found one from Arisaig across north-east to cross the railway line and it skirts down to the southern shore of Loch Morar (it’s obvious from the OS map which I don’t have with me).
Finally, had a great day riding down the east side of Loch Shiel from Glenfinnan – all dirt road but worth it for the views and silence.
Loads of riding up there I suspect, OS map and exploring are your friends! We’ll be back to ride some more.