Bit short on detail Matt, what is that? A new Sustrans Route? Another Tourist Board promotion? Someone's random holiday plans?
There's already a recognised Hebrides E2E, Hebridean Way, though the nature of the islands means to see the best there's a lot of out and back riding to do. I'm glad the above includes a trip out to Bahltos, one of my favourite roads of all time and some stunning beaches. There's some odd out and back legs on the mainland though, A87 and A830, I've ridden both to get somewhere, but I wouldn't go out of my way to do so again.
Having sent me down memory lane (Flipping heck it was over ten years ago) here's a couple of photos, the first two are on that route, but nothing Scotland has to offer IMO beats the beauty of Iona which isn't.
5 Shelter by
Paul, on Flickr
12 and more sand by
Paul, on Flickr
Deserted Beech on Iona by
Paul, on Flickr