Create your own bus

Hi all, I'm Giorgio from Italy.
I've discovered this site and this game today, and I want to ask something about the creation of a bus.
I've some practice with the modelling, infact I've built lot of bus for Midtown Madness 2, also very detailed (too much maybe, for that game), but my question was: Is it possible to create bus for this game using Zmodeler 3d?
Thank you.

That depends on whether ZModeler supports an X-file output that OMSI can understand. The OMSI model converter is optimized for x-file export from blender but should (can't promise...) work with every other x-file too.