Hi GBMark,
The figures seen on that picture are definitely the very expensive ones made by Fly, not SCX. The Saleen and the 'vette in the top left corner are both from Fly as well.
Fly has revealed that they intend to produce the grandstands and pits from the Catalunya track. The big question mark is WHEN it is going to happen.
If you can't wait, there are several options to go for, avoiding the far from sexy Scalextric cardboard buildings.
A first one are the pit / grandstand made by SCX. A modern building, sadly produced in unrealistic colours.
Another possibility is Carrera. The grandstands are wonderful, the pits not too bad. Big problem is that they are out of production and therefore command a high price on (German) Ebay.
The third option is SRA. It is a modern great looking resin building, but it is sold as a kit, so you must be ready to do the painting job.
And then there's FLY ... I saw some of the drawings, it really looks promising but as I said we've got to be patient (as usual with Fly).