Wow, so many feedback!
Really don't know where to start, and I'll try too address all of you.
The track size is roughly 7,50 m x 6,50 m, and it will be housed in a "slotcar hut" in my yard. (project is still underway, so housing space for the track is not yet defined).
As mentioned by Spa Modeller and one of the things I like most in this layout, is that La Source entry isn't parallel with the exit, which I tried to replicate in the layout. I understand that a different type of hairpin will be best for racing, therefore I'll try to remake the layout with a different hairpin at La Source, but still keeping the unparallel look of the entry and exit sections (perhaps using Matt's Curve #2 but replacing R2 by half R2).
What about the hairpin at Rivage??? The issues regarding La Source, made me look again at this section design and I'm not sure of it anymore.
Now exiting La Source on to Eau Rouge.
Rain Man pointed out very well that this particular section is all about the feeling of driving it at full speed. Flattening the section, and adding more straights to is approach, works ok. But I will lose the fastest section in the layout (Stavelot exit till Bus Stop Chicane), because I have to had a R3 curve at the Blanchimont kink (perhaps with some more tweaking between Rivage and Stavelot, this not necessary, but I haven't tried).
Regarding the elevation map of the track (thumbs up to Fast Lucky), I guess that will be very difficult to make it realistic. I think that I don't have enough track length to make the transitions smooth enough. Opinions regarding this matter will be appreciated (I run essentially low ground clearance cars, modern and classic Le Mans, and have a special love for the long ones).
Guess that's all. Would like to thank you all for the feedback and all the references to external sources for modelling and layout.
Just one more question before I go, and perhaps not the correct topic for this subject. What do you think about making this one digital.
Regards, MOD