Starting from a good dat, it is possible to get a good track. Objects, fences, bridges, buildings, stands, and trees can be imported from a Rfactor or AC version of that track (for example), but still, the work that remains to be done is enormous !!
Unfortunately I don't think we will see many real new tracks for GP4, except for some that Davide or Paulo are working on. There are hundreds and hundreds of hours of hard work for an increasingly smaller community ... but we are talking about a game that is 18 years old!
Mods & Tracks for GP4 - [www.mediafire.com]Keeping alive the GP4