First of all, my apologies for this image. It is rather large, so if you are on dialup or have bandwidth restrictions, stop now. I stitched this image from google earth to maintain some of the resolution. I then used the 1923 image as an overlay to get a track line. Here we have the 1923-1929 Le Mans Circuit:
I did not have time to make a track yet. The image will have to be sized down for use, and it will take a while as it is 17km! I can eventually do the rest of them, using basically the same map with different overlays. This project is certainly possible, but will take some time, which I do not have just at this moment. The only thing left for this map is to gather some elevations from google earth (or any other more reliable source), reduce the image, and make a track file!
EDIT: Image reduced to 1280x720 and the line cleaned up to match the track map more, but it will need to be rotated for a proper start. A few of the roads do not seem to connect any longer, and there is also the pesky round-about which probably didn't exist in the 1920's. Actually, with the site listed above, and this stitched map, this might not be as hard as I thought.
Only TWELVE more to go! hahaha (current track is already done by someone else). If you want, I can send you a PS file of this and you can give some of them a go?