Ralph Storer's book can be useful, so that's a good offer from eck.
Also Peter Koch-Osborne has a series for the Scottish Glens. These can be very useful, they describe what paths and tracks are like, ie whether they are ridable, or any gates etc. But again, these are from the 1990s/early 2000s, so may be out of date if tracks have deteriorated or new tracks built etc. Don't know if there are newer editions?
Not sure if there are any more useful up to date books. There are plenty of mountain bike guides, but most seem to prefer much tougher routes, so you would struggle on a tourer.
Also can be worth a look at Geograph.
http://www.geograph.org.uk/It has a lot of photos, covering many remote parts of Scotland. So the photos can show you what the tracks are like.
For Corrour, there are tracks along both sides of the loch, going from the station to Corrour Lodge. I think these may be a bit rough, but ridable slowly. Then its a wide, gravel track all of the way from the lodge to the main road in Glen Spean. But its still a fair distance to cycle. And it would be a lot further along the road to actually get to any shops, ie Spean Bridge.
There are also paths and tracks west from Corrour, heading for the top of Glen Nevis or Loch Eilde Mor and Kinlochleven. But these can be extremely rough, wet and boggy, and probably involve fording rivers. So not recommended, unless you want to push or carry your bike for miles.