is this map still up to date? Its from the other forum thread. Going by it I assume that its a semi permanent track using normal roads at least for the bridge parts, and this change in track surface should be visual and (if possible) "feelable". Regarding pit buildings, you need to play mental "Sims", what is needed where, where would the track marshals sit, where to hold winner ceremony, where are the toilets, which path do pedestrians go to the grandstands, how can rescue vehicles reach each part, where to pull cars that broke down, which corner needs brake markers, for which race series are these placed....
plenty of things to think about