That sounds like a really good idea, I like the sound of joining Cul Mor and Suilven and possibly doing Canisp. I just need some inside information really as it's hard to tell whether some of the land is crossable, what with all the water/Lochs. Thats good to know that you can cross the water between Loch Veyatie and Fionn Loch. If the water is not too high then this sounds like a good route. Obviously it all depends on weather. I suppose if we did link all the mountains and loop back around to Inchnadamph, we could then just walk directly south parallel to the road back to Knockan Crag where we would have left the car (not sure whether this is a good place to leave the car?).
I had one idea that maybe we could start in Lochinver and do some of the Sutherland Trail (sutherland-trail.info/map/index.cfm). We could follow it east and then maybe camp the first night on Suilven or Canisp. Then continue on it the next day to Inchnadamph and then climb Ben More Assynt and maybe camp on Ben for the second night. Then the next day get back on the Sutherland Trail and follow it back west until it meets the A894 road, cross the road and if we have enough energy, climb Quinag. From there we would head south west back to Lochinver, but this is where I am unsure. There's no obvious route other than follow the A837 back to Lochinver. Sounds good on paper but not sure whether this will be do-able.
Thanks for your suggestion though! It sounds like a perfect route (in good weather)