Thank you.
I've been researching it quite a lot. And didn't get right is the collada models work straight away or to wait for importer.
Looks like need to wait.
About the roads - I also had an idea to create a district, but looks like developers working on vector data importer from open maps, that will automatically do the roads from already existing data.
Actually my idea is to find a file of saved vector roads, if I could find out the code for vectors then it is easy to draw roads in vector software (better if it could be based on real coordinates) and then generate this file. This way will be easier to create cities.
But as I've said if Open map convertor will be done, then there will be no point for it.
