Working on these older tracks involves a lot more guesswork on my part. I don't have the kind of comprehensive speed trap and corner speed data that I can usually find for modern tracks. But YouTube has been a god-send.
Here is a great video from 1962 that really helped me figure out what was a corner and what was not a corner and relative speeds for those corners.
Here is a lovely map of the circuit on StatsF1.com (love that site). As I mentioned above, I am modeling the newer, longer 1957 version of the track. I'll probably work up the 1952 version at some point, but only 1 Grand Prix was run on that iteration so I'll do it another time.
Here is what I have so far.
I'm roughly 4 spaces short from my initial target. I'll see as I test if I need to add some spaces somewhere. I'm also going to have to think about width. The track is clearly pretty narrow until the road widens coming out of Grésil. My initial thought of running 3-wide from the start through Nouveau Monde is clearly wrong historically, but the 3rd lane of the 3 involved corners is basically run-off. As I test with more cars I may thin that out and see what happens.