I originally published my ideas of the route the sarsen stones were taken along to Stonehenge in Nov 2011
Since then the source of the stones has been mainly refined to the West Wood area and so I have just refined the route.
It is available at the this link:
I also took the opportunity to calculate the slope up on Salisbury Plain, it is 50m rise over 1km, a 1:20 slope.
I would emphasis that I think this line just defines a corridor, I am sure that on the ground sensible deviations to either side would be obvious.
Click to embiggen
Original route: https://drive.google.com/file/d/0B-nKFInptaG5MjQ1NmEwOTQtNTBiNS00ZTVkLTllYTctYjZjODhjZDFiZjRh/view?resourcekey=0-7kaPPkXmbCB8giLOVnU7Zw