If it is hungaroring 2003 by cesc, thats my base also.
But scenery looked kinda bad and as i dont know much about scenery (almost nothing in these early years),
it was more try-and-error without really knowing what to do. The result was acceptable but had to drive it in debug mode.
Since then i always kept this configuration and updated only the jams, and reading the reactions i suppose its ok.
I will not change it at this moment, maybe you could give it a go yourself.
As for istanbul : i gonna use a reduced belini, and i think on drafi's site its not a belini-track.
Just checked drafi site : where are these tracks? or has he moved them on another site?